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<article xmlns:xlink="http://www.w3.org/1999/xlink">
  <front>
    <journal-meta />
    <article-meta>
      <title-group>
        <article-title>Maximizing customer satisfaction and business profits through Big Data technology in Society 5.0: a crisis-responsive approach for emerging markets⋆</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Piotr Kulyk</string-name>
          <email>p.kulyk@wez.uz.zgora.pl</email>
          <xref ref-type="aff" rid="aff2">2</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Viktoriia Hurochkina</string-name>
          <email>v.hurochkina@g.elearn.uz.zgora.pl</email>
          <xref ref-type="aff" rid="aff0">0</xref>
          <xref ref-type="aff" rid="aff2">2</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Bohdan Patsai</string-name>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Olena Voronkova</string-name>
          <email>Voronkova303@gmail.com</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Oksana Hordei</string-name>
          <email>ohordei@gmail.com</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>State Tax University</institution>
          ,
          <addr-line>31 Universitetska Str., Irpin, 08200</addr-line>
          ,
          <country country="UA">Ukraine</country>
        </aff>
        <aff id="aff1">
          <label>1</label>
          <institution>Taras Shevchenko National University of Kyiv</institution>
          ,
          <addr-line>60 Volodymyrska Str., Kyiv, 01033</addr-line>
          ,
          <country country="UA">Ukraine</country>
        </aff>
        <aff id="aff2">
          <label>2</label>
          <institution>University of Zielona Góra</institution>
          ,
          <addr-line>9 Licealna, Zielona Góra, 65-417</addr-line>
          ,
          <country country="PL">Poland</country>
        </aff>
      </contrib-group>
      <fpage>82</fpage>
      <lpage>94</lpage>
      <abstract>
        <p>Big Data technology is a powerful tool for businesses in emerging markets, especially in times of crisis. It can help them understand their customers better, improve their products and services, and increase their profits. This study aims to use Big Data technology to design personalized loyalty programs that can enhance customer satisfaction and loyalty in the context of Society 5.0, a vision of a human-centered society that integrates physical and digital realms. The study builds on utility theory, firm theory, welfare economics, and Big Data theory to develop a conceptual framework for information-centric loyalty programs. These programs can use Big Data to analyze customer behavior, preferences, income, and mobility in real time and ofer customized incentives and discounts. The study also explores the benefits and challenges of using Big Data technology for businesses in emerging markets, as well as its role in crisis management and recovery. The study suggests that Big Data technology is essential for businesses to gain a competitive edge and survive in the dynamic and uncertain environment of Society 5.0.</p>
      </abstract>
      <kwd-group>
        <kwd>customer satisfaction</kwd>
        <kwd>business profits</kwd>
        <kwd>emerging markets</kwd>
        <kwd>crisis periods emerging markets</kwd>
        <kwd>welfare theory</kwd>
        <kwd>needs theory</kwd>
        <kwd>Big Data technology</kwd>
        <kwd>loyalty programs</kwd>
        <kwd>predictive analysis</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <sec id="sec-1">
      <title>1. Introduction</title>
      <p>
        In the aftermath of the Coronavirus disease (COVID-19) pandemic [
        <xref ref-type="bibr" rid="ref2">2</xref>
        ] and the repercussions
of the Russian-Ukrainian war [
        <xref ref-type="bibr" rid="ref3">3</xref>
        ], harnessing competitive advantages in the realm of goods
and services assumes paramount importance. Informed by foundational principles of economic
theory, a pivotal question arises: can the doctrine of utility be efectively employed? This
query finds resonance in the proposition put forth by Jules Dupuit [
        <xref ref-type="bibr" rid="ref4">4</xref>
        ], who posited that
the same commodity could be sold to distinct customers at disparate prices, irrespective of
cost diferentials. Furthermore, Dupuit’s insights unveil a prerequisite condition for such a
strategy – a monopolistic market position that empowers the seller with pricing authority. This
monopolistic structure permits discernment between consumer groups of varying afluence,
allowing for calibrated pricing based on divergent proclivities. Here, the underpinning of
Dupuit’s utility theory predominantly rests on the consumer’s vantage.
      </p>
      <p>
        Contemporaneously, the quest for optimizing individual needs and interests was also explored
by Dionysius Lardner, a British economist and engineer. In his analysis [
        <xref ref-type="bibr" rid="ref5">5</xref>
        ], Lardner delved into
maximizing income from the prism of firm theory. A significant facet of Lardner’s contributions
pertains to the strategic utilization of price competition to heighten profits. His scrutiny
of railway tarifs furnished insights into their diferential structuring based on distance and
cargo characteristics, attributed to variations in elasticity and consumer demand heterogeneity.
Notably, Lardner’s work underscores the pivotal role of demand elasticity in satiating consumer
needs.
      </p>
      <p>
        The economics of welfare, as elucidated by Pigou [
        <xref ref-type="bibr" rid="ref6">6</xref>
        ], furnishes a pivotal framework for
comprehending price competition and its multifaceted types. Pigou postulates a nexus between
the feasibility of price competition and a set of general conditions, contingent on the
noninterdependency of demand prices for distinct units of commodities. To this end, it necessitates
a scenario where units of goods transacted in one market cannot be seamlessly transposed to
another market, coupled with the restriction that units of demand in one market remain exclusively
tethered to their native domain. However, achieving such equilibrium is intricate, demanding
comprehensive information encompassing consumer benefits and purchasing potential across
domestic and global markets. This daunting task is further compounded by the complexities
introduced by analogous products. As the post-COVID-19 and post-conflict landscape unfolds,
the global race for end consumers is poised to escalate.
      </p>
      <p>
        A salient determinant of success resides in positive emergent properties, which pivot on
innovation germination and progression, particularly in the realm of consumer engagement
and burgeoning economies [
        <xref ref-type="bibr" rid="ref7 ref8 ref9">7, 8, 9</xref>
        ]. The catalysts of such positive emergent properties coalesce
around the zenith of human capital development. Pertinently, in the context of developing
economies, intricate examinations are undertaken to scrutinize innovative human capital
development facets across various domains [
        <xref ref-type="bibr" rid="ref10 ref11">10, 11</xref>
        ]. The contours of human capital realization within
developing economies are further compounded by the far-reaching impacts of COVID-19 and
the Russian-Ukrainian war, leading to demographic shifts and internally displaced populations.
      </p>
    </sec>
    <sec id="sec-2">
      <title>2. Literature review</title>
      <p>Industry 4.0 will contribute to the emergence of a new Society 5.0. Innovative technologies
of Industry 4.0 will contribute to the rapid recovery and overcoming the consequences of the
Russian-Ukrainian war.</p>
      <p>
        Fundamental provisions of formation Society 5.0 and implementation of innovative Industry
4.0 technologies are considered in a number of work. Kitsuregawa [
        <xref ref-type="bibr" rid="ref12">12</xref>
        ] highlight the questions
of how Japan is launching Society 5.0 and the vision for a future smarter society. The work
of Aquilani et al. [
        <xref ref-type="bibr" rid="ref13">13</xref>
        ] is devoted to the advanced manufacturing solutions, augmented reality,
the cloud, and big data in the emergence of a new level of social development. Rahmanto et al.
[
        <xref ref-type="bibr" rid="ref14">14</xref>
        ] note the potential of huge advantages of big data technology in the emergence of a new
level of social development and a breakthrough revolution in people’s lives thanks to the use of
technologies taking into account the humanitarian aspect.
      </p>
      <p>
        Foresti et al. [
        <xref ref-type="bibr" rid="ref15">15</xref>
        ], Hayashi and Nagahara [
        <xref ref-type="bibr" rid="ref16">16</xref>
        ] highlight the role of artificial intelligence in the
functioning of automated planning and data analysis with the help of smart programs, smart
infrastructure, smart systems, and smart networks.
      </p>
      <p>
        Ellitan [
        <xref ref-type="bibr" rid="ref17">17</xref>
        ] focuses on the lack of HR (human resources) skills and the existing problem of
security of communication technologies, and the inability of stakeholders to change, while
in society 5.0 there is a clear priority due to the reliable and stable operation of production
machines, which in turn leads to the negative consequences of worker losses places through
automation. for the rapid adaptation of human capital for the benefit of improving public and
business services, achieving a high level of literacy in working with data and its data analysis
is an important condition. Simatupang [
        <xref ref-type="bibr" rid="ref18">18</xref>
        ] noted that the slow progress of Society 5.0 can
be achieved through the development of integrated information technologies in universities
and education. De Felice et al. [
        <xref ref-type="bibr" rid="ref19">19</xref>
        ] noted that in order to achieve Society 5.0 it is important to
manage the transition and identify the enabling factors that integrate Industry 4.0. According
to Önday [
        <xref ref-type="bibr" rid="ref20">20</xref>
        ], digital transformation creates new values and becomes a pillar of the industrial
policy of many countries. Therefore, in Society 5.0, the basis of quality functioning is the
achievement of convergence between physical and cyberspace. But it should be noted that the
key drivers of the implementation of Industry 4.0 in Society 5.0 will contribute to rapid recovery
in the post-war period, new economies will emerge, the only question will be the transfer of
technologies for recovery and adaptation at the fastest pace.
      </p>
    </sec>
    <sec id="sec-3">
      <title>3. Methodology</title>
      <p>If you determine the level of demand in various market segments and in the markets of various
countries, you can set an individual price for each unit of a homogeneous product, which will be
equal to the price of its demand. This price is called the reserved price of the buyer. In its pure
form, such a pricing policy is dificult to implement. The company does not know the reserved
price of each buyer, but also cannot know its level from the buyer, since it is in his interests to
reduce its value. It is the lack of information that does not allow the full introduction of perfect
price competition and the largest financial efect.</p>
      <p>The options (based on the collected data) for setting diferent prices for certain consignments
of goods in accordance with the same demand function are used today. In practice, it often takes
the form of various kinds of discounts (depending on the size of purchases, prepaid periods,
etc.). In this case, the monopolist increases the volume of sales, and the consumer can achieve
certain economies of purchase volume.</p>
      <p>Diferentiation of buyers into groups with diferent demand functions and subsequent pricing
for each such group occurs separately during market segmentation. Segmentation is usually
carried out by gender, age, income level, social status. There is the practice of setting diferent
prices for students, senior citizens, people with disabilities and people of working age.
Segmentation of end consumers is being made considering price and non-price ways of increase
influence on sales (figure 1), which are reflected in loyalty programs.</p>
      <p>However, the discount loyalty programs have some disadvantages:
• the ability to saturation and, consequently, decrease the eficiency of use;
• the complexity of how to form a group of supporters as well as the completion of the
closure of the current program;
• the remoteness of non-regular customers and the usual price overpricing.</p>
      <p>Nowadays discount accumulators and bonus cards are mostly used. Among the reasons that
led to a change in the accounting policies of many enterprises there is a possibility of:
• the creation of various ofers for various groups of clients;
• provision of discounts in the form of a certificate is an incentive for the client to return to
the purchase of well-known goods and services;
• tracking the movement of regular customers and changing their preferences.</p>
      <p>Introduction of such loyalty programs became possible thanks to the rapid development of
information technologies that are capable to solve new problems. In addition, these cards can
significantly reduce the turnover of small bills. But the main feature of these changes is the
personalization of discount programs.</p>
      <p>Personalization of seller-buyer relationships, using data mining (OLAP technology), allows
you to analyze the dependencies of any values contained in the database and respond to the
situation quickly. Important information for the seller is not only attracting new customers, but
also controlling relationships with regulars. Firstly, the sales increase may be a consequence
of a successful advertising company and, secondly, sales decrease for personalized discount
cards is a consequence of low level of service, which will lead to a sharp decrease in sales in the
medium and long term.</p>
      <p>Currently, in order to increase the efectiveness of consumer segmentation the enterprise
is trying to group them according to the level of the product value perception. In this case
consumers are allocated:
• price-sensitive and thus easily change suppliers;
• sensitive to the quality of goods and services;
• are focused on creating long-term relationships and, as a result, strive to establish
longterm partnerships to improve the quality of goods and services.</p>
      <p>Internet trade has the greatest relevance during the lockdown. It is devoid of such
shortcomings that are characteristic of the real sector of the economy:
• is not strictly connected with the territory of the physical existence of the consumer;
• can be carried out without any territorial restrictions;
• the rapid development of the information society and information growth gave impetus
to the development of new methods of its implementation.</p>
      <p>
        In particular the Big Data theory is rapidly developing [
        <xref ref-type="bibr" rid="ref21 ref22">21, 22</xref>
        ]. The term “Big Data” usually
refers to a series of approaches, tools and methods for processing of structured and
unstructured large volumes and the diferent nature data to obtain a consumer acceptable result. The
introduction of the term “Big Data” is associated with Cliford Lynch [
        <xref ref-type="bibr" rid="ref23">23</xref>
        ] who was an editor of
Nature magazine and prepared a series of topical works. Quite often the “triple V” criterion is
used to describe “Big Data”: volume, velocity, variety. Some leading manufacturers of business
intelligence software, such as SAS [
        <xref ref-type="bibr" rid="ref24">24</xref>
        ], additionally use two more: variability and complexity.
In addition to growing speeds and data varieties, data flows can also be characterized by periodic
peaks. Such peak data loads can be dificult to manage. It is worth to note the complexity factor
as the most important factor when you are working with Big Data. While increasing the amount
of data to variable , the number of links between them grows in proportion to ! ( factorial).
So the problem is not limited only to the processing of large amounts of data but also requires
an additional solution to the problem of analyzing connections’ !.
      </p>
      <p>To identify a consumer on the Internet data for analysis is needed. The profile of the network
is formed not only with the registration data on particular Internet resources but also activity
in social networks, forums, blogs and the like. Thus, data reflecting the user is unstructured.</p>
    </sec>
    <sec id="sec-4">
      <title>4. Results</title>
      <p>
        Leading corporations have developed platforms for big data business analytics [
        <xref ref-type="bibr" rid="ref21">21</xref>
        ]. In particular
IBM, creating a full profile from social network data in the Big Data Analytical System, uses all
the data that is more or less related to a specific consumer (table 1). At the first stage analysis of
the texts takes place, at the second the linking of attributes takes place, at the third formation
of statistical models and at the fourth formation of business logic take place.
      </p>
      <p>Economic-mathematical modeling of the socio-economic system based on online Big Data
algorithms makes it possible to predict consumer behavior based on the identification of business
logic and to form a consumer profile in the decision-making system. This method is traditional,
but the selection of characteristic functional features for forecasting eficiency and optimization
of Slick-Through-Rate forecasting processes is special in view of machine learning as a tool for
economic and mathematical modeling of the management decision-making system.</p>
      <p>Taking into account the presented data structure of the full profile of a social network user
and the model of Big Data online algorithms, we have the possibility of flexible targeting of
the target audience, adaptation of advertising content in accordance with user interests, the
possibility of forecasting the efectiveness of advertising and its impact on consumer behavior.
In addition, when building a model of Big Data algorithms, it is worth taking into account trafic
segmentation and the Real-Time Bidding Exchange RTB auction (corresponding to the business
logic of the consumer).</p>
      <p>The use of Big Data in e-commerce provides such competitive advantages:
1) customer service: Big Data helps to give the consumer a sense of self-worth because his
needs are maximally met by creating a certain connection between him and the brand. This
cultivates consumers’ loyalty and influence on their emotional level;
2) dynamic and point pricing: analysis of market data allows you to set an attractive price for
each specific consumer;
3) personalization: in the process of analyzing consumers’ information, personalized solutions
are ofered that become a competitive advantage for the client;
4) predictive analysis: Big Data allows you to carry out medium-term forecasting in the market
and respond accordingly to possible changes in the market environment.</p>
      <p>
        An example of this approach can be an application developed for the clothing brand Free
People which provided sales growth of 38 percent [
        <xref ref-type="bibr" rid="ref25">25</xref>
        ]. The application allows users to discuss
the latest collections, share their photos on Pinterest and Instagram social resources and vote
for the best photos. This interaction is an example of the monetization of accumulated data by
retailers using social platforms.
      </p>
      <p>Point discounts of Internet commerce can be divided by analogy with traditional commerce
into two types depending on the technology that is used. The first type is personalized which
provides for mandatory registration on a web resource, the second is not personalized (does not
require registration). The first option of a point discount is for a price ofer based on customer
data, a history of web surfing (viewing products on a store page) and purchase history. Retailers
often use social media accounts to register. It simplifies the registration procedure and gains
access to user data. This significantly increases the amount of data to be analyzed.</p>
      <p>Based on the data (table 1) on using Big Data, a consumer profile is formed and its segment
afiliation is determined. In the future the client is ofered an individual price ofer. The price
that is ofered is minimal in order for the fact of purchase. In addition, goods are ofered in
accordance with the target audience. In other words, an individual approach to proposals is
formed based on the analytical processing of unstructured data.</p>
      <p>
        For convenience we have built EPC diagram [
        <xref ref-type="bibr" rid="ref26">26</xref>
        ], which is often used to describe the workflow
in ArisExpress environment (figure 2). If the visitor is not a consumer of goods and services,
HTTP-cookie analysis of the web page is carried out that allow carrying out authentication,
storage of personal user preferences and settings, session state tracking of user access, maintain
user statistics.
      </p>
      <p>It is also possible when there is not enough data to determine the profile of the visitor. This
may be due to both the low activity of the Internet user and his conscious reluctance to “external
tracking”. One such way is to use an anonymous session. In this case the basic ofers are
determined by the system.</p>
      <p>
        For machine learning target audience targeting [
        <xref ref-type="bibr" rid="ref27">27</xref>
        ], we use the Datch approach, taking into
account the social network user profile, to build a model of online Big Data algorithms. The
Datch approach is based on two-level testing of Big Data algorithms: training dataset and test
dataset. The condition of the model is the constancy of the data of the decision-making system
over time. At the same time, the dynamism of the system and the resonance of news on the
website can become an emergent property of the socio-economic system, which will contribute
to a further change in the trend.
      </p>
      <p>The model of Big Data algorithms for the task of predicting CTR is based on the
systematization of the modeling process by stages and on a certain set of parameters of the data structure
of the complete profile of a social network user.</p>
      <p>− 1
+1 =  ∑︁ (, , ℎ, ,  , )</p>
      <p>=1
+ (, , ℎ, ,  , )
(1)
where:
+1 – function social customer profile;</p>
      <p>() – loss function for optimization Personal characteristics (Identifiers, Interests, Social
status);
() – loss function for optimization Relationships (Personal, Business);
(ℎ) – loss function for optimization Chronological activity (Purchase intention, Current
location, Feedback on products and services, Incident, Loyalty Facts);</p>
      <p>() – loss function for optimization Goods and interests (Personal relation to goods,
Shopping history, Recommendations);</p>
      <p>() – loss function for optimization Politics (Attitude to power, Political views, Perception
of reform);
() – loss function for optimization Life events (Personal, Reactions to events).
() – regularization function Personal characteristics (Identifiers, Interests, Social status);
() – regularization function Relationships (Personal, Business);
(ℎ) – regularization function Chronological activity (Purchase intention, Current location,
Feedback on products and services, Incident, Loyalty Facts);</p>
      <p>() – regularization function Goods and interests (Personal relation to goods, Shopping
history, Recommendations);
reform);
the following form:
() – regularization function Politics (Attitude to power, Political views, Perception of
() – regularization function Life events (Personal, Reactions to events).</p>
      <p>The loss function for optimizing the profile characteristics of a social network user will have
 (, , ℎ, ,  , ) = ‖ − ‖
2</p>
      <p>Under the conditions of a linear loss function in order to optimize the characteristics of the
social network user profile, the formula will have the following form:</p>
      <p>(, , ℎ, ,  , ) = ⟨, ⟩</p>
      <p>Under conditions of activation of emergent properties in the socio-economic system, such
as dynamic system changes or trend changes under the influence of high-profile news on the
site, which contribute to the manifestation of binary dependence at the bifurcation point, the
function will have the following form:
(2)
(3)
(4)
(5)
(6)
(7)
(8)
 – sigmoidal function:
(, , ℎ, , , ) = ( ((, , ℎ, ,  , ) ) − )
 ( ) =</p>
      <p>1
1 + 

=1
+1 = −  ∑︁  =   −   =   − ∇ (, , ℎ, , , )
With the activation of emergent properties in the socio-economic system, the regularization
function will have the following form:
(, , ℎ, ,  , ) =
1
2 ‖‖ 2
Under the conditions of if  &gt;</p>
      <p>0, then the iteration of the machine learning algorithm will
include a stepwise gradient descent algorithm and will look like:</p>
      <p>The resulting formula for optimizing management decisions, taking into account the
parameters of the data structure of the full profile of a social network user, will look like this:
, =
{︃0
−
︁(  +√ )︁</p>
      <p>|| ≤ 1
( − ()1) || &gt; 1
where x and n iteration parameters, 1, 2 are regularization intensity parameters according to
the selected type and  ,  – are input parameters characterizing the learning rate.</p>
      <p>Since, based on the above, in order to achieve the optimum at each step of the algorithm
execution, the optimal decision is made and the previous ones are not foreseen, then this
model belongs to the Greedy algorithm. A characteristic feature of these algorithms is relative
simplicity and speed of execution.</p>
      <p>
        This technique of point discount has been actively developing over the past three years. One
of the first companies that ofered this service was Freshplum whose founder was Sam Odai.
Later Freshplum joined the TellApart company [
        <xref ref-type="bibr" rid="ref24">24</xref>
        ], which operates in the market of services
for online stores. Moreover, the algorithm for potential customers’ selection of this company
uses a number of “non-standard” indicators such as: place of residence (city center or outskirts),
weather, etc. This allows you to increase the likelihood of making a purchase up to 36 percent
[28].
      </p>
      <p>For the first time the analysis of diferential pricing in online stores was conducted by the
The Wall Street Journal. The editors conducted a study [29] of pricing in 200 online stores.</p>
      <p>The economic situation in the world is extremely dependent on the geopolitical risks that
can now be observed (for example the corona virus pandemic and the consequences of the
Russian-Ukrainian war). Therefore, the widespread use of Big Data concept may increase the
profitability of enterprises. The use of Big Data methods will become an additional source of
budget revenues after taxation. This will maximally satisfy the needs of consumers whose
incomes have recently been declining due to devaluation and inflationary processes. In order
to increase competitiveness of European goods and services markets the use of big data is a
mandatory requirement of our time.</p>
    </sec>
    <sec id="sec-5">
      <title>5. Conclusions</title>
      <p>In an era characterized by global geopolitical uncertainties, underscored by events such as
the COVID-19 pandemic and the repercussions of the Russian-Ukrainian war, the economic
trajectory of nations is intricately interwoven with the contours of geopolitical risks. Amidst
this backdrop, the strategic assimilation of foundational principles of Big Data emerges as an
indispensable tool for enhancing enterprise profitability. The application of Big Data
methodologies assumes the mantle of an auxiliary revenue stream, akin to taxation, endowed with the
potential to assuage the financial strains borne by consumers grappling with income
diminutions catalyzed by devaluation and inflationary forces. Additionally, as European markets for
commodities and services necessitate a heightened competitive edge, the incorporation of Big
Data not only becomes a compelling imperative but a quintessential mandate of our epoch.</p>
      <p>At the nexus of this pursuit lies the economic-mathematical model, a potent tool that drives
optimization at each algorithmic juncture. This model, emulating the Greedy algorithm’s
attributes of simplicity and swift execution, engenders optimal decision-making. With Big
Data as its cornerstone, this methodology fosters an environment where the quintessence of
profitability and competitiveness converge to navigate the complexities of today’s economic
landscape.</p>
    </sec>
    <sec id="sec-6">
      <title>Acknowledgments</title>
      <p>The work was carried out within the framework of the program to support scientists from
Ukraine during the implementation of the project “Mechanism to strengthen the social
responsibility of refugees and people fleeing the Russian armed conflict on the territory of Ukraine”
on funding from the Polish Academy of Sciences and the National Academy of Sciences of the
United States and University of Zielona Góra.
of Financial Technologies and Cryptocurrency Markets, Springer, Singapore, 2020, pp.
211–231. doi:10.1007/978-981-15-4498-9_12.
[28] A. Tanner, Diferent Customers, Diferent Prices, Thanks To Big Data, 2014. URL: https:
//cutt.ly/q018Ugn.
[29] J. Valentino-DeVries, J. Singer-Vine, A. Soltani, Websites Vary Prices, Deals Based on
Users’ Information, The Wall Street Journal (2012). URL: https://www.wsj.com/articles/
SB10001424127887323777204578189391813881534.</p>
    </sec>
  </body>
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