Indiana University-Purdue University Indianapolis (IUPUI) / This dissertation proposes a framework (TruSStReMark - Trust-based Service Selection and Recommendation for Online Software Marketplaces) to model, quantify, and monitor trust of software services and to perform trust-based service selection and recommendations. It provides methods to analyze and aggregate external reviews, pertaining to specific QoS attributes, of software services by performing subjective logic-based operations. This framework, first, defines trust of a software service using theory of belief and extends the multi-level software specifications to represent the trust-based attributes. It, then, proposes enhancements to two prevalent algorithms for selecting and recommending software services from a marketplace. Finally, the performances of the enhanced selection and recommendation algorithms are improved by parallelizing them. When compared with the prevalent Content-based and Collaborative filtering-based approaches, the results show that, the TruSStReMark is able to produce better results in terms of quality measured using HR (Hit Ratio) and ARHR (Average Reciprocal Hit-Rank) metrics. In addition, the parallelized versions of the trust-based selection and recommendation algorithms improve the end-to-end runtime. The TruSStReMark will enable users to select services, which are trustworthy, from online software marketplaces and use them in composing quality-aware distributed systems.

This dissertation is a compilation of three essays that analyze price dispersion in an online retail marketplace. Price dispersion is a measure of the variation in prices that sellers charge for products. Online price dispersion has been thoroughly analyzed in the past decade as it has numerous implications for firm pricing strategy as well as consumer welfare. Chapter 1 of this dissertation offers a literature review of price dispersion research, and discusses key explanations as to why this phenomenon exists on the web. Also, a literature review of shop-bots is presented as they are similar to online marketplaces and form the basis of the three studies. Chapter 2 is the first study, and it establishes the existence of price dispersion in online marketplaces and offers a comparison with price dispersion in shop-bots. It is determined that online marketplaces may have less variation than on shop-bots, yet the price dispersion is still high. Chapter 3 is the second study and it explains much of the dispersion found in the online marketplace through differences in seller service quality and seller reputation. A seller's reputation was found to be the key contributor to variation in the online marketplace hence, study 3, which is chapter 4 of this dissertation, employs an experimental approach designed to offer a perspective of buyers and sellers to determine why price varies with reputation and if consumers value the reputation score. It was determined that buyers prefer sellers with strong long run reputation scores more than sellers with strong short-term reputation scores. Based on these reputation scores sellers want to try to offer a higher price than consumers are willing to pay, and sellers think that a strong score conveys higher levels of trust than buyers believe. This mismatch between how sellers think consumers respond, and how the consumers actually respond could be another driver of price dispersion online. A discussion of the implications of these research studies is offered in Chapter 5. / Business Administration

Increasing attention to sustainability and environmental concerns implies changes in consumer preferences, whereof companies need to provide offerings characterized with a focus on sustainability laden concepts such as the Circular Economy (CE), aligning with these changes. How to communicate sustainability has therefore become a focus of attention when formulating marketing strategies. However, sustainability is a complex concept and it could therefore be questioned whether everyone irrespective of, for instance, gender, age, education and other personal attributes perceive it similarly and display similar attitudes toward the concept. Based on a quantitative online survey with 1010 participants, this study examines the impact of personal attributes on the receptiveness of sustainability communication and customer loyalty in the context of Peer to Peer (P2P) marketplace platforms, and discerns how sustainability communication and customer loyalty are interrelated. Also, it explores whether sustainability communication from providers of P2P marketplace platforms can be considered to play a role in accelerating the transition to a CE. Findings suggest that personal attributes affect the receptiveness of sustainability communication and loyalty intentions, this was particularly evident for females and individuals living a sustainable lifestyle. The findings also reveal a positive relation between sustainability communication and customer loyalty, where environmental engagement, consistency between preferences for a certain appeal and actions made on the basis of the same preference, along with trustworthy content seem to strengthen that relationship. Lastly, the findings conclude that sustainability communication from P2P marketplace platforms providers can increase the number of individuals trading pre-owned items which implies for more people participating in resource-efficient activities, which ultimately fosters a CE. / Ökad uppmärksamhet kring begreppet hållbarhet och miljöfrågor innebär förändrade konsumentpreferenser med högre krav på hållbara lösningar, varav företag behöver erbjuda produkter och/eller tjänster som präglas av hållbarhet för att möta kundernas behov. Hur man kommunicerar hållbarhet har således blivit en viktig aspekt när företag utformar sina marknadsföringsstrategier. Hållbarhet är däremot ett komplext begrepp, varav det kan ifrågasättas om alla oavsett kön, ålder, utbildningsnivå och andra personliga egenskaper har en liknande attityd gentemot hållbarhet, och uppfattar hållbarhetskommunikation på samma sätt. Baserat på en kvantitativ onlineundersökning med 1 010 deltagare undersöker denna studie effekterna av personliga egenskaper på mottagligheten av hållbarhetskommunikation och kundlojalitet i kontexten peer-to-peer (P2P) marknadsplattformar, samt hur hållbarhetskommunikation och kundlojalitet står i relation till varandra. Studien undersöker också om hållbarhetskommunikation kan anses påskynda övergången till en cirkulär ekonomi. Resultaten från studien ger en indikation på att personliga egenskaper påverkar mottagligheten för hållbarhetskommunikation och konsumentens intentioner att vara lojal. Detta var särskilt påtagligt för kvinnor och individer som lever en hållbar livsstil. Resultaten visar även på en positiv relation mellan hållbarhetskommunikation och kundlojalitet, varav högre miljöengagemang, preferenser som går i linje med handlingar, och trovärdigt innehåll tenderar att stärka denna relation. Slutligen kan det konstateras att hållbarhetskommunikation kommunicerat av P2Pmarknadsplattformar kan öka antalet personer som säljer och köper begagnade föremål, varav fler människor deltar i resurseffektiva aktiviteter, vilket främjar övergången till en cirkulär ekonomi.