Table A5. BERTopic Topic-to-theme... | Emerald Publishing

Table A5.

BERTopic Topic-to-theme mapping (56 topics consolidated into five themes)

Theme	Inductive/deductive	Associated BERTopic topics (examples)	Representative topic keywords	Rationale for consolidation	Illustrative reviews ( Appendix E)
Theme 1: Dual-role participation	Inductive	Topics 4, 12, 28 and 55	buy, sell, seller, buyer, both, transition, flip, income, collectible, role	Reviews in these topics contained explicit dual-role language (“I buy and I sell”), transition narratives (“started as a buyer, now I sell”) and income-generating motivations. Topics 4 and 12 captured buyer/seller identity framing; Topics 28 and 55 captured role-transition accounts and new-seller structural disadvantage	R89, R242, R257, R100 and R267
Theme 2: Marketplace experience and community	Inductive	Topics 0, 18, 27, 54, 14, 22 and 32	community, party, app, platform, fun, friends, chat, experience, people, together	These topics contained platform infrastructure evaluations (positive and negative), community belonging expressions and the “party” metaphor for platform sociality. Topics 14, 22 and 32 captured technical failure and mobile-specific issues, consolidated here as infrastructure sub-experiences. Topics 18 and 54 yielded the most concentrated community-belonging language	R1086, R1093, R126, R206 and R364
Theme 3: Role of trust	Inductive	Topics 3, 15, 43, 47 and 52	trust, honest, scammer, refund, seller, platform, accountability, reliable, safe, governance	Topics in this cluster contained platform-level trust evaluations (governance, dispute resolution and seller accountability failure) and seller-level trust assessments (performed authenticity, transparency, narrative embedding). Topics 43 and 47 concentrated warnings about scammers; Topic 52 captured positive governance experiences and the “portfolio trust” pattern	R862, R123, R137, R316 and R621
Theme 4: Antecedents of CTT	Deductive	Topics 5, 6, 20, 40 and 50	collection, community, deal, friendship, value, mystery box, FOMO, communication, responsive, opportunism	These topics were mapped deductively to CTT's five antecedent dimensions. Topic 5 concentrated switching cost and collection integrity language; Topic 6 captured relationship benefit (transactional and interactional) expressions; Topic 20 contained shared values and value-violation discourse; Topic 40 concentrated communication quality evaluations; Topic 50 captured opportunistic behavior including mystery-box financial regret and scam disclosures	R493, R223, R316, R876, R101, R274, R63 and R945
Theme 5: Outcomes of CTT	Deductive	Topics 8, 11, 35, 44 and 53	recommend, leave, delete, cooperate, conflict, block, refund, uncertainty, return, confidence	Mapped deductively to CTT's five outcome dimensions. Topic 8 captured acquiescence and trust-enabled purchasing confidence; Topic 11 contained cooperation and peer-helping behaviors; Topic 35 concentrated propensity-to-leave and exit-performance accounts; Topic 44 captured functional conflict patterns (including the blocking behavior); Topic 53 contained uncertainty reduction expressions and transactional confidence language	R243, R135, R1091, R1048, R1100, R427 and R1043

Theme	Inductive/deductive	Associated BERTopic topics (examples)	Representative topic keywords	Rationale for consolidation	Illustrative reviews (Appendix E)
Theme 1: Dual-role participation	Inductive	Topics 4, 12, 28 and 55	buy, sell, seller, buyer, both, transition, flip, income, collectible, role	Reviews in these topics contained explicit dual-role language (“I buy and I sell”), transition narratives (“started as a buyer, now I sell”) and income-generating motivations. Topics 4 and 12 captured buyer/seller identity framing; Topics 28 and 55 captured role-transition accounts and new-seller structural disadvantage	R89, R242, R257, R100 and R267
Theme 2: Marketplace experience and community	Inductive	Topics 0, 18, 27, 54, 14, 22 and 32	community, party, app, platform, fun, friends, chat, experience, people, together	These topics contained platform infrastructure evaluations (positive and negative), community belonging expressions and the “party” metaphor for platform sociality. Topics 14, 22 and 32 captured technical failure and mobile-specific issues, consolidated here as infrastructure sub-experiences. Topics 18 and 54 yielded the most concentrated community-belonging language	R1086, R1093, R126, R206 and R364
Theme 3: Role of trust	Inductive	Topics 3, 15, 43, 47 and 52	trust, honest, scammer, refund, seller, platform, accountability, reliable, safe, governance	Topics in this cluster contained platform-level trust evaluations (governance, dispute resolution and seller accountability failure) and seller-level trust assessments (performed authenticity, transparency, narrative embedding). Topics 43 and 47 concentrated warnings about scammers; Topic 52 captured positive governance experiences and the “portfolio trust” pattern	R862, R123, R137, R316 and R621
Theme 4: Antecedents of CTT	Deductive	Topics 5, 6, 20, 40 and 50	collection, community, deal, friendship, value, mystery box, FOMO, communication, responsive, opportunism	These topics were mapped deductively to CTT's five antecedent dimensions. Topic 5 concentrated switching cost and collection integrity language; Topic 6 captured relationship benefit (transactional and interactional) expressions; Topic 20 contained shared values and value-violation discourse; Topic 40 concentrated communication quality evaluations; Topic 50 captured opportunistic behavior including mystery-box financial regret and scam disclosures	R493, R223, R316, R876, R101, R274, R63 and R945
Theme 5: Outcomes of CTT	Deductive	Topics 8, 11, 35, 44 and 53	recommend, leave, delete, cooperate, conflict, block, refund, uncertainty, return, confidence	Mapped deductively to CTT's five outcome dimensions. Topic 8 captured acquiescence and trust-enabled purchasing confidence; Topic 11 contained cooperation and peer-helping behaviors; Topic 35 concentrated propensity-to-leave and exit-performance accounts; Topic 44 captured functional conflict patterns (including the blocking behavior); Topic 53 contained uncertainty reduction expressions and transactional confidence language	R243, R135, R1091, R1048, R1100, R427 and R1043