The Intention Of Indonesian Middle-Class Millennial Consumer To Purchase Through E-Commerce

: The rise of the e-commerce industry in Indonesia started 10 years ago and Indonesia is predicted as the market leader in Southeast Asia by 2025. The growth of this industry is driven by an increasing number of middle-class millennial consumers who are technology savvy and have higher purchasing power. Despite the importance of this consumer segment, there are limited studies about the intention of middle-class millennial consumers to purchase through e-commerce, particularly in developing countries, such as Indonesia. This study intends to examine the factors leading to consumer intention to shop online by including perceived security and perceived privacy to extend the theory of Technology Acceptance Model (TAM). Data were collected from 187 respondents and analyzed using PLS-SEM. The findings showed that perceived usefulness, perceived ease of use, perceived security, and perceived privacy influences consumers’ intention to shop in e-commerce, which was mediated by their attitude toward e-commerce. Among these influencing factors, perceived usefulness had a greater role in shaping consumer attitudes toward e-commerce than perceived ease of use, perceived security, and perceived privacy..


Introduction
Over the past years, Indonesia's e-commerce market has rapidly grown 60-70% on an annual basis since 2014 and will reach USD60 billion in 2020 (Australian Trade and Investment Commission, 2018).According Google & Temasek (2019), transaction value based on the Gross Merchandise Value (GMV) method recorded on Indonesia's e-commerce platform in 2015 reached USD1.7 billion equivalent to IDR294 trillion and the market will be worth USD53 billion by 2025, making it the leader of e-commerce in Southeast Asia in the near future (Tempo, 2019).Euromonitor transcribes the proliferation of e-commerce in Indonesia shows that people shopping interest in 2014 has reached USD1.1 billion, higher than Thailand and Singapore (Katadata, 2014) and Badan Pusat Statistik (BPS, 2014) recorded that in the last 10 years increased by 17 percent with a total number of ecommerce businesses reaching 26.2 million units (Idea, 2019).In Indonesia, there is an increasing number of sessions for e-commerce applications from 8 billion in 2016 to 30 billion in 2019 (Google et al., 2019).The rise of e-commerce market in Indonesia triggered by the behavior of urban middle-class millennial who are described as the early adopters of technology and the concept of shopping on e-commerce platforms (The Jakarta Post, 2017).The growth of the world population of middle-class is expected to reach 5.5 billion by 2030, with the majority 66% represented by Asians (European Commissions, n.d.).In 2020 to 2030, Indonesia's middle-class population will be overtaken by India, and China.Since 2010, the population of the middle-class in Indonesia is the largest, followed by the Philippines, Vietnam, Thailand and Malaysia, and in the future will become one of factors in the economic growth due to their purchasing power (Alvara Research Centre, 2016).There are 74 million of middleclass and affluent customers (MAC) in Indonesia and will have reached 141 million people by 2020, approximately 64 percent from total population in Indonesia (Boston Consulting Group, 2013).According to Asian Development Bank, the majority of the Indonesian middle class are living in urban areas with daily spending $2 to $40, which can be further categorized into lower-middle class, middle-middle class, and upper-middle class (Alvara Research Centre, 2016).Among these people, some of them are young consumers who were born between 1984 and 1999, also known as the millennial generation.The projection of urban-middle-class millennial population in Indonesia will have reached 35 million in 2020 (Alvara Research Centre, 2017).The Indonesian Central Bureau of Statistics reported that 63.5 million people from the total 179.1 million productive population in 2020 are millennial (IDN, 2020).Millennial consumers are a significant contributor to the growth of the ecommerce industry and dominated 64% of online shoppers in Indonesia (Ipsos, 2018).Millennial are described as male and female within the 21-36 age group in the year of 2020, which are divided into junior millennial (21-28 years old) and senior millennial (29-36 years old) (IDN, 2020).During 2012 to 2016, the Indonesian customer in the e-commerce industry within the millennial age group 18-34 years old was 80% dominated by male (Australian Trade and Investment Commission, 2018), however in 2017 female customers reached more than 60% (Kumparan, 2017).In 2017 there are 20 million online shoppers in Indonesia and expected to increase to 65 million by 2020 (Statista, 2020).Despite this potential increasing number of online shoppers, there are some issues that may hinder consumers to shop online.One of the main problems faced by e-commerce in developing countries, such as Indonesia, is the distrust of users towards website security.Kompas (2020) reported that 91 million user data and more than 7 million merchant data from Indonesian unicorn Tokopedia were leaked and sold on the internet black market site.Indonesian Minister of Communication and Information, Rudiantara, said that Indonesia still does not have laws governing the protection of personal data, which is very different from developed countries like in Europe (Tirto, 2019).There are many factors that encourage people to buy products or services through e-commerce, one of them is attitude toward e-commerce (Pavlou & Fygenson, 2006;Smith et al., 2008).Consumer intention to shop online is also influenced by their level of adoption to e-commerce technology.Many studies about consumers' intention to purchase online are applying the theory of Technology Acceptance Model (TAM) (e.g.Cheng et al., 2006;Chandio et al., 2013).TAM was proposed by Davis in 1989 as an extension to the Theory of Reasoned Action (TRA).This theory is particularly used to explain individual's adoption of information technology (Lee, Kozar, & Larsen, 2003), which is relevant to e-commerce.Referring to this theory, one's intention to adopt new technology in the context of this research is online shopping, influenced by perceived usefulness and perceived ease of use (Changchit et al., 2018).Although TAM is popular to study one's adoption and intention to use information technology and information systems (Rupanjali, Bhal, & Kapoor, 2013), some scholars argue that additional variables are still needed to strengthen predictive power of behavioral intention (Davis, 1989 2018) that looked at the influencing factors of purchase intention through online shopping of university students in Thailand.Due to the technological savvy of young consumers and the value of middle-class consumers to the nation's economy, it would be more interesting to focus on this segment, so that marketers may gain deeper insights on the online purchasing behavior of this consumer segment.The purpose of the study is to examine the influence of perceived usefulness, perceived ease of use, perceived security, and perceived privacy on purchase intention to shop online that mediated by attitude toward e-commerce of Indonesian middle-class millennial.The research questions for this study are described in the following: (1) How do perceived usefulness, perceived ease of use, perceived security, and perceived privacy influence attitude toward e-commerce?, (2) How do perceived ease of use influence perceived usefulness?, (3)How does attitude towards e-commerce influence the intention to purchase in e-commerce?

2.1purchaseintention
Purchase intention is defined as the consumer's preference for buying a product or service (Keller, 2001).Ajzen (1991) states that the main aspect that drives individuals to perform a behavior is intention.According to Fitzsimons and Morwitz (1996), decision makers use and measure purchase intentions as input to decisions.Future sales can be predicted and correlated with purchase intentions and investigations are needed as to why purchase intentions do not always translate into sales.There are several theories that can be used to see customer purchase intentions towards e-commerce, one of them is the technology acceptance model (TAM) (Hernández, 2010).TAM is considered as the most effective model in being able to test consumer acceptance and behavior towards technology.In TAM there are two cognitive factors that can determine a person's perception of information systems viz perceived usefulness (PU) and perceived ease of use (PEOU).Previous studies that applied TAM to examine customer acceptance towards technology reported a significant relationship between perceived usefulness and perceived ease of use as determinants of consumer acceptance of technology that drives their intention to purchase through e-commerce (Amaro & Duarte, 2015; Agag & El-Masry, 2016; Vahdat et al., 2020).

2.2.Theory of Technology Acceptance Model (TAM)
A few theoretical models have been implemented to explain user acceptance and usage behaviour regarding emerging the information technologies.In any case, TAM, as a model to understand customer attitudes towards mobile technology use (Rivera et al., 2015), known as the most accepted paradigm (Venkatesh & Davis, 2000).
As an adaptation of Theory of Reasoned Action (TRA), there are two new variables: perceived usefulness, and perceived ease of use to replace prior variables (McFarland & Hamilton, 2006).Davis (1989) as the originator of the Theory of Technology Acceptance Model (TAM) states that the perception of risk has a significant relationship to the level of acceptance of the technology.TAM provides customer intention with justification and validity, explanation of variances in customer behaviour within the context of technology (Kim et al., 2016).Davis (1989) introduced it as a model to predict behavioral intention to adopt computer technology and information systems.According to TAM, consumers' attitude and behavioral intention to use technology or system depends on the perceived usefulness (PU) and the perceived ease of use (PEOU).TAM is widely used in computers and technology-related behavior (Cheng et al., 2006;Chandio et al., 2013).In the past, the TAM has been used by researchers to investigate factors that affect the acceptance and adoption intentions of technological innovations (Cheng et al., 2006;Chandio et al., 2013).It is also the most widely used theory in studies that measure the adoption intentions of internet or e-banking (Wang et al., 2003;Cheng et al., 2006)

2.3.Perceived Usefulness
Perceived usefulness is described as the beliefs of target customers that a specific technology will generate significant value (Olaleye et al., 2018).TAM posits that behavioural intention is determined by attitude towards the system used, and the perceived usefulness, where attitude is a direct function of usefulness (Gupta, 2017).Perceived usefulness is the essential web architecture highlights.Shah et al (2014) notices functionality, enjoyment, reliability, process and responsiveness as the website features alludes to elements, for example, usability, data introduction, navigation, personalization, and usefulness highlights of a site as the plan qualities of a site.The classification proportions of a site are perplexing and hard to be assessed by clients though web architecture highlights and traits are all the more straightforward and simpler to be assessed by clients.It is accepted that clients will in general assess the safety efforts of a site dependent on their experience and quick interface with the framework (Shah et al., 2014).Along these lines, other than clients' view of classification, mechanical arrangements and confirmations, clients' encounters and impression of a site interface are affecting the attitude of the customer to purchase the product.Technology Acceptance Model can be applied to look at the customer attitude toward e-commerce and its belongings, and the acknowledgment to buy over the web.This attitude is influenced by two principal factors: usefulness and ease of use of e-commerce.For usefulness, the client endeavors to get numerous advantages from electronic buy, for example, setting aside cash, time, and the huge choices of items or administrations.Ashraf (2014) conducted research using TAM to study online shopping adoption in Pakistan and Canada.The findings showed that attitude has a significant relationship as a mediator between perceived usefulness and the intention to shop online in both countries.Similar findings are reported by various scholars indicating that a framework which is found out and overseen effectively fulfills people and intention to use the system (Daştan, 2016).Therefore, the hypothesis is formulated as: H1 : Perceived usefulness has a positive influence on customer's attitude toward e-commerce.Davis et al. (1989) portrayed that the objective framework in the "Perceived of ease of use" should be freed from exertion and anticipated by the customer.Davis (1993), therefore, stated that a specific framework is required in the absence of extortion.Celik (2008) found that people who see new innovation in a valuable view are more eager to learn and use.Perceived ease of use is fundamental in influencing customer participation in ecommerce (Molina-Castillo, 2016).Nowadays, the mandatory requirements for e-commerce applications in the middle of a digital environment are easy to use, and the application is considered as useful and also usable.In this manner, if a site has an efficient interface to help consumers to discover the data they require for exchanges, clients will see it as a dependable and reliable site that plans to build up a drawn-out relationship with its consumer (Shah et al., 2014).Contends that consumers may utilize web architecture highlights to pass judgment on the classification measures and traits of a site.Attitudes are known as an indication and reaction to determine people's effort and willingness to try (Baek, 2013).A complicated system can impact people's attitude and ease of use (Rogers, 1995).However, the "perceived ease of use" is described as user's expectation for target system with less effort (Davis et al.,1989), which is also considered as a significant point to understand user's response toward information technology (Agarwal & Karahanna, 2000;Chau & Hu, 2001;Hong et al., 2002;Liu & Wei 2003).Past studies revealed a significant relationship between intention to use and perceived ease of use (Daştan, 2016;Agarwal & Prasad, 1999;Venkatesh & Davis, 2000;Davis et al., 1989).In e-commerce context, perceived ease of use is described as the user's perception that online shopping facilitated the process of shopping more easier and with less effort (Pelaez, et al., 2017).Previous research reported that ease of use significantly influenced attitudes towards online shopping (Agag & El-Masry, 2016; Ayeh, 2015).An easy to use system will be considerably useful, therefore TAM suggests that an easy to use online shopping site may lead to perception of usefulness.Any enhancement to ease of use affecting the increased performance (Davis, Bagozzi, & Warshaw, 1989).It is expected there is a direct effect from ease of use to perceived usefulness (Venkatesh & Davis, 2000).

2.4.Perceived Ease of Use
Likewise, a few examinations have affirmed that perceived ease of use has a solid impact on perceived usefulness (Daştan, 2016).Therefore, the hypotheses regarding the perceived ease of use are formulated as:H2 : Perceived ease of use has a positive effect on perceived usefulness.H3 : Perceived ease of use has a positive effect on customer attitude toward e-commerce.

2.5.Perceived Security
Privacy and security concerns are mutually exclusive, yet they influence one another (Balapour & Sabherwal, 2016).Furthermore, they are both really sensible for customers in online trades (Balapour & Sabherwal, 2016).It has been built up that in online business exchanges, client protection observations emphatically impact their security recognitions (Balapour & Sabherwal, 2016).Shah (2014) exhibited that clients' impression of protection on informal community destinations influences their security recognitions.Indahingwati (2019) keeps up the conviction that security concerns recommend the security of cash related data, for example, credit card data or online record passwords.She states that an online exchange is secure if the data comes from the correct party and appears at the correct segment without being seen, changed, or destroyed during the headway technique and cutoff.She also mentions that the battle that clients believe online to be a moral issue and imagine that online shippers should ensure the security of delicate data which they hold.Balapour and Sabherwal (2016) indicated that the forerunners of protection and security influence one another, distinguishing the need to additionally research the collaboration between these two similarly significant constructs in protection and security writing.Against this setting, this assessment acknowledges that assurance acknowledgments impact clear security.Thus, this assessment loosens up and adds to the interconnection of insurance and security composing concerning adaptable applications.On the other hand, the intellectual parts of the inward factor sub-segment allude to the degree of getting, thought and acknowledgment of data for people who will at that point structure a progression of contemplations that take an interest in adding to the last disposition of people to dynamic to have results of merchandise or administrations they need.Positive cognitive aspects will likewise give positive input to purchasers to purchase an item, just as negative criticism or awful experience that has been acquired by customers before is additionally a solid thought to decline to purchase an item/administration item.In its journey, humans, as complex social creatures, cannot be separated from elements such as ethics, security, morals and norms in behaving, including in terms of purchases (Indahingwati, 2019).The previous study showed that when shopping on the e-commerce website, customers are generally concerned about site security and protection (Chang, 2016).Sites could decline shoppers' apparent dangers of the web condition by advancing security highlights (Chang, 2016), for example, expressly clarifying security and security arrangements and guidelines (Chang, 2016).Taking care of clients' issues helps buyers to build up subjective trust toward sites and successfully diminishes apparent dangers.Therefore, the hypothesis is formulated as:H4 : Perceived security has a positive effect on customer's attitude toward e-commerce.

2.6.Perceived Privacy
Online trust guarantee is important for consumers because it can help them to reduce security and privacy violations when conducting online commercial transactions (Blut et al., 2015).Miyazaki (2001) believes that information privacy and consumer concerns are the most important issues faced by a technology-based environment.The perceived privacy protection can be used as a reference for online sellers to protect consumers obtained during online transactions against unauthorized disclosure or use (Kim et al., 2008).Consumers can be suspicious that online sellers will even sell their personal information to other companies and persons.It is because during online transactions, online sellers request and collect a large amount of consumer's personal information, such as name, home address, telephone numbers, email address, bank account, and credit card number during online transactions (Kim et al., 2008).Therefore, consumers have concerns about how websites manage their personal information.Riquelme and Roman (2014) there are several things that can affect privacy on consumers' online trust, including gender, age and education.E-commerce can build consumer trust as long as they can conduct online transactions in accordance with consumer expectations.This statement supported from previous studies by Gurung and Raja (2016) found that privacy and security affect consumer attitudes in using ecommerce, where this attitude has a significant influence on consumer purchase intentions.McCole et al. (2010) conducted a study on online trust that included attitudes and purchase intentions.The findings found that when consumers have high privacy awareness it will affect their attitude towards online purchases.Through this reality, if consumers have lack confidence that their privacy will be protected by online sellers, they may not continue to purchase through e-commerce because they will feel threatened (Van Dyke, Midha, & Nemati., 2007; Ponte et al., 2015).Therefore, the hypothesis is formulated as:H5 : Perceived privacy has a positive influence on customer's attitude toward e-commerce.

2.7.Attitude toward e-Commerce
Eagly and Chaiken (2007) determine that an individual's favor and disfavor for a particular object can be seen from his psychological path or can be classified as attitude.Attitude has an important role in influencing thoughts, feelings of consumers in decision making.Barber, Taylor, & Deale (2010) suggests that consumers' attitude should be investigated, along with sustainability practices, and also the purchase intentions.Various attitude models should be developed to investigate consumers' attitude and purchase intentions.Several studies have found that attitude has a strong influence on customers' intention to purchase (

3.1.Sample
A quantitative research approach is used to obtain a picture on the middle-class millennial's online purchase intention.The online questionnaires were randomly distributed to targeted respondents domiciled in Jakarta, as one of urban areas in Indonesia, and represent the millennial generation within the age range of 21 -36 years old in 2020, also represent middle-class with daily spending of 2 -20 USD.
A convenience sampling method was applied to select the samples.Convenience sampling in some cases is viewed as 'coincidental tests' since components might be chosen in the example basically, as they simply happen to be arranged, spatially or authoritatively, close to where the specialist is leading the information assortment (Etikan, 2016).Prior to the main survey, a pilot survey of 25 samples were conducted for reliability and validity testing.Data were collected in May 2020 by distributing questionnaires to target respondents via online.In total, 187 valid responses were used to analyze perceived usefulness, perceived ease of use, perceived security, perceived privacy, attitude toward e-commerce and purchase intention of the middle-class millennial generation.

3.2.Measures
The questionnaire consists of several sections.The first section consists of ten (10) questions related to the socio-demographic characteristics of the participant (age, marital status, work, etc).The questions in this segment is to classify and filter respondents.Is it middle class and millennial or not.The other six sections were asking respondents' assessment on the variables in this study.The questions were developed based on a literature review.There were five items measuring perceived usefulness adopted from Dickinger and Meyer (2008), Vahdat et al. (2019), and Changchit et al. (2018, five items measuring perceived ease of use adopted from Dickinger and Meyer (2008), five items measuring perceived security adopted from (Balapour, 2020), and five items measuring perceived privacy adopted from (Balapour, 2020).The items measuring attitude toward e-commerce and purchase intention were adopted from Suntornpithug and Khamalah (2010), in which each variable was measured by 5 items.Each item measuring variables of interest was measured by a 5-point Likert scale (1 as Strongly disagree -5 as Strongly agree).
In this research, we used structural equation modeling (SEM) for data analysis, a statistical modeling technique that is very cross-sectional, linear and general.Included in SEM is factor analysis (factor analysis), path analysis (path analysis) and regression (regression).It is a statistical technique used to construct and test statistical models that are usually in the form of causal models.(Sarwono, 2010).The reason for using SEM is because SEM has characteristics that are an analytical technique to confirm rather than to explain.Using SEM in this study to determine whether a particular model is valid or not rather than use it to find a particular model is suitable or not, although SEM analysis often also includes elements used to explain (Sarwono, 2010).This study applied PLS-SEM due to the small sample size, which was less than 250 as required by CB-SEM.

4.1.Profile Of Participants
There were 238 questionnaires collected from May 11-12, 2020 with a usable rate 78.6 percent for 187 respondents.As presented in Table 1, the respondents' profile consisted of female (53.5%) and male (46.5%) and dominated by millennial juniors aged 21-28 years (64.7%).There were respondents with single status (71.1%), married status (28.3%) and divorced/widowed (0.5%).The majority of respondents had bachelor's degrees (71.7%) and around (56.7%) work as employees with an average monthly income of Rp3,800,001 -Rp10,000,000 (56,7%).More than half of respondents (56.7%) had a total daily spending in general for Rp60,001 -Rp150,000.The results of the sample proved that the majority of respondents actively shop through e-commerce, around 48.7% shopped 1-2 times in a month, followed by 31.0%more than 3 times, and the rest (20.3%) shopped less than once a month.The most frequently purchased products are food and beverages (55.1%) and home accessories (54.5%).Reasons many respondents like shopping through e-commerce is because of the competitive prices (77.5%) and the time efficiency (73.3%).Around 28% respondents bought electronics, gadgets, hobbies, and child care products through e-commerce.
Table 2 presents the descriptive statistics, validity, and reliability of the items.This study used descriptive analysis to look at the characteristics of the data set.The respondents agreed that e-commerce helped them to meet their needs.Specifically, the benefits and conveniences offered by e-commerce affect their attitude in conducting transactions.The purchase intention of middle-class millennial consumers through e-commerce was influenced by perceived usefulness and perceived ease of use, followed by their trust in the securities of how an e-commerce site can protect their personal data privacy.They agreed that the four variables, perceived ease of use (PEOU), perceived usefulness (PU), perceived security (PS) and perceived privacy (PP) can influence their attitude to shop through e-commerce.
This study also did construct validity and reliability tests.As shown in Table 2, construct validity was measured by factor loading and average variance extracted (AVE).One item, PS5, was excluded from the analysis due to low factor loading (less than 0.5).After deleting this item, the factor loading of remaining items were ranging from 0.801 (Perceived Privacy) to 0.927 (Perceived Security) and AVE from 0.543 (Perceived Privacy) to 0.761 (Perceived Security).The reliability was measured by Cronbach's alpha which ranged between 0.763 (Purchase Intention) and 0.894 (Perceived Security) and composite reliability that ranged between 0.854 (Perceived Privacy) and 0.927 (Perceived Security).The result of discriminant validity (see Table 3) indicated that all factors were not fundamentally related since the square root of AVE was greater than the correlation between two variables.The hypotheses were examined using Partial Least Square -Structural Equation Modeling (PLS-SEM).Table 4 and Figure 2 presents the effects of exogenous factors on the endogenous variable.
As shown in Table 4, all hypotheses were supported.The influence of perceived usefulness on attitude toward e-commerce was positive and significant (=0.430,p-value < 0.01), which supported H1.The influence of perceived ease of use on perceived usefulness was also positive and significant (=0.754,p-value < 0.01), which supported H2.Perceived ease of use had a positive influence on attitude toward e-commerce (=0.283,p-value < 0.01), which supported H3.The effect of perceived security influence on customer's attitude was positive and significant (=0.111,p-value < 0.05), which supported H4.The influence of perceived privacy on customer's attitude was positive (=0.121,p-value < 0.05), which supported H5.Lastly, customer's attitude had a positive influence on purchase intention (=0.764,p-value=0.000),which supported H6.
This study found that perceived usefulness played a more significant role in affecting customers' intention to use e-commerce to shop via attitude toward e-commerce.In contrast to perceived usefulness, perceived security was the least significant factor that influenced intention to shop in e-commerce.The finding also showed that perceived ease of use had direct and indirect influence on attitude toward e-commerce.

5.Discussion
There is a positive relationship between the perceived ease of use to perceived usefulness which is supported by previous studies (Ashraf, 2014;Agag & El-Masry, 2016).The behaviour of middle-class millennial to accept new technology, such as e-commerce, is more adaptable and more eager to learn how to use it.Those behaviors resulted in a generation preference of online shopping through e-commerce instead of conventional stores on a frequent basis.
The influence of perceived usefulness and perceived ease of use on attitude toward e-commerce is positive and significant.These elements are the most important element that shapes consumer's attitude toward e-commerce.In addition, respondents are really concerned about the usefulness towards e-commerce, for example the time efficiency.If they perceive that e-commerce really saves their time for shopping and offers competitive prices, they are more likely to have favorable attitudes toward e-commerce and willing to do the purchasing toward ecommerce.
Results revealed that there is a significant effect between perceived security and perceived privacy with attitude toward e-commerce.Even though Indonesia is predicted to be the e-commerce market leader in the future, it's contrary to the lack of awareness of personal data protection, and no laws governing data privacy and security.Also no further investigations conducted for any leaked data and no punishment/fine from the government to the e-commerce entity.This condition resulted in distrust of users towards website security in Indonesia.
Several studies have revealed a relationship between attitudes toward purchase intentions (Chen, 2007; Tang and Medhekar, 2010; Michaelidou and Hassan, 2010) which are correlated with the results of this research.Thus, attitudes towards e-commerce have an important role towards purchase intentions.As of some variables that influence attitudes, here in the form of perceived usefulness, perceived ease of use, perceived security and perceived privacy also have an important role on consumer purchase intentions.This study revealed that the hypothesis between consumer attitude and purchase intention is accepted in high significance.The more positive customer's attitude toward e-commerce, the more likely they are to purchase online.

6.Conclusion
This study examines the role of perceived usefulness, perceived ease of use, perceived security, and perceived privacy related to consumers' purchase intention to shop online mediated by attitudes towards e-commerce in developing countries, particularly middle-class consumer millennials in Indonesia.The findings validate the usefulness of TAM to explain consumer behavioral intentions toward e-commerce.Both variables in TAM, namely perceived ease of use and perceived usefulness, have positive effects on consumers' attitudes toward ecommerce.It is also found that perceived ease of use has a positive effect on perceived usefulness.This study extends TAM by including perceived security and perceived privacy to the model and found that both variables have a significant effect on attitudes toward e-commerce.As consumer's attitudes toward e-commerce increases, he/she is more likely to purchase through e-commerce.

6.1.Theoretical Implication
The growth of e-commerce in Indonesia is very rapid and is even predicted to be the leader of e-commerce in Southeast Asia in 2025.However, limited studies have analyzed the factors affecting consumers, especially middle-class millennial shopping through e-commerce in developing countries, especially in Indonesia.Although the number of e-commerce users continues to increase, there are still many issues related to the lack of security of users personal data.Reflecting on previous research, this study examines the factors that influence consumer attitudes toward purchase intention through expanding TAM theory by adding new variables namely perceived security (PS) and perceived privacy (PP).The results showed that by entering these two new variables can further enrich the findings of attitude and purchase intention especially in middle-class millennial consumers.

6.2.Managerial Implication
Using data provided in this research, business practitioners would understand the factors that influence the purchase intention through e-commerce for this middle-class millennial segment as the significant contributor in the e-commerce market.In terms of socio-demographic factors, almost half of the correspondents consider that shopping through e-commerce is no more convenient than shopping in conventional stores.It is the convenience and competitive prices that encourage them to continue choosing to shop online.This research proves that perceived security and perceived privacy affect the attitudes of consumers to perform online purchase transactions, but their effects are not too significant.Government also has an important role in the growth of ecommerce in Indonesia.Contributions that can be made are through construct laws governing the protection of the privacy and security of consumers' personal data, Further studies should be conducted for these factors for further examination and enhancement.However, it is suggested that improvement and enhancement should be conducted by the management in terms of perceived usefulness and perceived ease of use such as time efficiency and user friendly to more strengthen the relationship of these factors to the intention to purchase.

7.Limitations and Recommendation
In this study, the data collected were from 187 respondents.Respondents who participated in the study are from the millennial generation in Greater Jakarta while there are several urban areas in Indonesia such as Jakarta, Surabaya, Medan, etc.Therefore, future research should include a broader respondent niche, such as collecting respondents from several major cities in Indonesia with a greater number of sampling.This study also recommends to include additional variables, such as customer trust and perceived risks as mediators of the relationship between perceived privacy, perceived security, and attitude toward e-commerce to have a better understanding of consumers' purchase intention through e-commerce.
; Rupanjali et al., 2013).Changchit et al. (2018) stated that the factors that influence consumers to shop online in developing countries might be different from those in developed countries.In the ecommerce context, perceived security (PS) and perceived privacy (PP) are believed to influence consumer behavioral intentions (Hanudin, 2007; Nasri & Charfeddine, 2012; Ashraf et al., 2014).Consumer's perception over the security features of a website have been cited as one of the determining factors of website success (Greunen, Herselman, & Niekerk, 2010).Kim et al. (2008) also confirmed the relationship between information quality, perceived security, and perceived privacy protection and trust, these factors have a great purchase influence on e-commerce.Users' perception of security and privacy can influence their confidence in making online transactions and trigger user behavior intentions (Balapour, 2020).Hence, perceived security and perceived privacy variables are relevant in influencing consumer's willingness to shop online, particularly in countries that have low Internet security and data protection such as Indonesia.Furthermore, most studies in e-commerce were also not specified analysing the behaviour of the young middle-lass population (e.g., Razafimandimby, 2017; Molina-Castillo, 2016; Agag & El-Masry, 2016; Ayeh, 2015; Ravallion, 2010; Soopramanien & Robertson, 2007) particularly in developing country.One exception is the study of Changchit et al. ( Das, 2014; Zhang & Kim, 2013).Based on research conducted in Malaysia, Hasbullah et al. (2016) reveals that attitudes towards online shopping have a significant positive relationship with intention to buy.Their findings show a link between positive attitudes and increased intention to purchase through e-commerce.This is supported by other research such as Sheppard et al. (1988), Bredahl (2001), Chen (2007), Tang and Medhekar (2010), and Michaelidou and Hassan (2010).Therefore, the hypothesis is formulated as: H6 : Attitude toward e-commerce has a positive influence on intention to purchase in e-commerce.

Table 2 .
Descriptive statistics, validity and reliability (n=187) believe there is an effective mechanism to address any violation of the information I provide with an online store. I