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Title page 1

Contents 6

Foreword 4

Acknowledgements 5

Abbreviations and acronyms 10

Executive summary 12

1. Introduction 15

1.1. Scope 16

1.2. Approach 16

1.3. Sources of evidence 16

1.3.1. Meetings with stakeholders 16

1.3.2. Stakeholder questionnaires 17

1.3.3. Seller survey 17

1.3.4. SimilarWeb data 17

1.3.5. Publicly available data and information 17

References 18

2. Online marketplaces and their ecosystems 19

2.1. Digital platforms and the e-commerce ecosystem 20

2.1.1. Market dynamics in e-commerce 20

2.1.2. The role of markets in the e-commerce ecosystem: Intersections and dynamics 21

2.2. Online marketplaces as intermediation services 22

2.2.1. Definition of online intermediation services 22

2.2.2. Defining online marketplaces: Distinguishing criteria and key characteristics 23

2.2.3. Online marketplaces' service offering 24

2.3. Online marketplaces' neighbouring markets 25

2.3.1. Online classified ads (OCAS) 25

2.3.2. Online retail 26

2.4. Online marketplaces' related markets 27

2.4.1. Logistics and delivery 27

2.4.2. Payments 29

2.4.3. Authentication and login 29

2.4.4. Cloud Infrastructure 29

2.5. Online marketplaces' supporting markets 30

2.5.1. Comparison shopping services (CSS) 30

2.5.2. Advertising 31

References 32

Notes 32

3. Regulatory framework 34

3.1. Competition law 36

3.2. Digital Markets Act: the ex-ante regulation of digital platforms 39

3.3. Other relevant laws: The broader legislative framework governing online marketplaces in the EU Single Market 41

3.3.1. Legislative framework governing online sales within the EU Single Market 42

3.3.2. Consumer law 43

3.3.3. Transparency in advertising, publishing and delivery pricing 44

3.3.4. Data and privacy law 44

3.3.5. The Digital Services Act (DSA) 45

3.3.6. Financial services and payments 46

References 47

Notes 48

4. Market functioning and key actors 55

4.1. E-commerce trends 56

4.2. Online marketplaces 59

4.2.1. Poland 59

4.2.2. Lithuania 71

4.2.3. Latvia 79

4.3. Neighbouring markets 82

4.3.1. Online classified ads 82

4.3.2. Online retailers 86

4.4. Related and supporting markets 89

4.4.1. Logistics and delivery services 89

4.4.2. Comparison-shopping services 93

References 95

Notes 96

5. Key market features in Poland, Lithuania and Latvia 114

5.1. Local platforms and language support 115

5.2. Price sensitivity and use of comparison-shopping services 117

5.3. Logistics 118

5.4. Payment services 119

References 121

Notes 121

6. Competitive constraints on online marketplaces 124

6.1. Online marketplaces - consumer side 127

6.1.1. Scope of online marketplaces on the consumer side 127

6.1.2. Substitutability between different types of online marketplaces 128

6.1.3. Substitutability with other retail channels 133

6.1.4. Geographic scope of competition 136

6.1.5. Conclusions 137

6.2. Online marketplaces - seller side 137

6.2.1. Scope of online marketplaces on the seller side 138

6.2.2. Substitutability between types of online marketplaces 139

6.2.3. Substitutability with other retail channels 140

6.2.4. Geographic scope of competition 141

6.2.5. Conclusions 142

References 143

Notes 144

7. Assessing the state of competition between online marketplaces 147

7.1. Market share estimates 148

7.1.1. Poland 149

7.1.2. Lithuania 156

7.1.3. Latvia 162

7.1.4. Conclusions 167

7.2. Key dimensions of horizontal competition in online marketplaces 169

7.2.1. Network effects 169

7.2.2. Economies of scale 171

7.2.3. Switching costs and multi-homing 173

7.2.4. Vertical integration 177

7.2.5. Conclusions 178

7.3. Vertical, conglomerate and ecosystem dimensions of competition in online marketplaces 179

7.3.1. Competitive impact of logistics integration 180

7.3.2. Advantages and risks arising from payments services integration 182

7.3.3. Expansion into other consumer-facing services 183

7.3.4. Implications of geographic expansion 184

7.3.5. Data accumulation across platform ecosystems 185

7.3.6. Risks to competition from expanding ecosystems 188

7.3.7. Conclusions 189

7.4. Risks of reduced market contestability, entrenchment and tipping 190

References 194

Notes 195

8. Concerns vis-à-vis business users 200

8.1. Structural features of the relationship between online marketplaces and sellers 201

8.1.1. Potential conflict of interest arising from the dual role of online marketplaces 201

8.1.2. Seller's structural reliance on online marketplaces 203

8.1.3. Informational and logistical imbalances in platform governance 206

8.1.4. Conclusion 208

8.2. Potential competitive risks to sellers 209

8.2.1. Self-preferencing 209

8.2.2. Imposition of unfair trading conditions 212

8.2.3. Most Favoured Nations (MFN) clauses 213

8.2.4. Tying 216

8.3. Conclusion 218

References 220

Notes 220

9. Summary of findings 224

9.1. Incumbent online marketplaces have limited competitive constraints in all three jurisdictions 226

9.2. The leading incumbent players hold substantial power vis-à-vis sellers 230

10. Recommendations 232

10.1. Measures to address platforms' market power by enhancing enforcement, market monitoring and compliance 233

10.1.1. Investigate where necessary to tackle existing risks of anticompetitive conduct 234

10.1.2. Establish dedicated ongoing monitoring mechanisms for digital markets 234

10.1.3. Ensure data use is not restricting competition 237

10.1.4. Strengthen the institutional framework to enhance antitrust enforcement 237

10.1.5. Reduce barriers to entry and expansion by increasing compliance 238

10.1.6. Facilitate cross border competition and promote the EU single market 239

10.2. Measures to ensure pro-competitive marketplace trading practices 239

10.2.1. Evaluate the effective implementation and enforcement of the P2B Regulation 242

10.2.2. Exploring a code of conduct for online marketplaces 243

References 243

Notes 244

Annex A. SimilarWeb data analysis methodology 245

Annex B. Relevant laws and regulations 254

Tables 8

Table 4.1. User numbers and revenue of online marketplaces in Poland 60

Table 4.2. Number of parcel locker machines by provider, Lithuania, 2025 92

Table 5.1. Online purchasing nationally and cross-border, as a share of individuals who purchased online in the last three months, 2023 115

Table 6.1. Cross-browsing behaviours of Polish consumers for the top 5 online marketplaces, January 2025-December 2025 130

Table 6.2. Cross-browsing behaviours of visitors to top Lithuanian marketplaces, January 2025-December 2025 130

Table 6.3. Cross-browsing behaviours of visitors to 220.lv, January 2025-December 2025 130

Table 6.4. Cross-browsing behaviours of visitors to selected Polish general online marketplaces and specialised fashion retailers, January 2025-December 2025 134

Table 6.5. Cross-browsing behaviours of visitors to selected Polish general online marketplaces and specialised electronics retailers, January 2025-December 2025 135

Table 7.1. Core general online marketplaces (consumer side) by share of traffic in Poland, January 2025-December 2025 149

Table 7.2. All general online marketplaces (consumer side) by share of traffic in Poland, January 2025-December 2025 150

Table 7.3. Cost per Paid Visit (in EUR) for the years 2023-2025 152

Table 7.4. Core general online marketplaces (seller side) by share of traffic in Poland, January 2025-December 2025 154

Table 7.5. All general online marketplaces (seller side) by share of traffic in Poland, January 2025-December 2025 154

Table 7.6. All general online marketplaces (seller side) by share of traffic in Poland, November 2025-February 2026 155

Table 7.7. Core general online marketplaces (seller side) by share of traffic in Poland, November 2025-February 2026 156

Table 7.8. Core general online marketplaces (consumer side) by share of traffic in Lithuania, January 2025-December 2025 156

Table 7.9. All general online marketplaces (consumer side) by share of traffic in Lithuania, January 2025-December 2025 158

Table 7.10. Core general online marketplaces (seller side) by share of traffic in Lithuania, January 2025-December 2025 160

Table 7.11. All general online marketplaces (seller side) by share of traffic in Lithuania, January 2025-December 2025 161

Table 7.12. All general online marketplaces (seller side) by share of traffic in Lithuania, November 2025-February 2026 161

Table 7.13. Core general online marketplaces (seller side) by share of traffic in Lithuania, November 2025-February 2026 162

Table 7.14. Core general online marketplaces (consumer side) by share of traffic in Latvia, January 2025-December 2025 162

Table 7.15. All general online marketplaces (consumer side) by share of traffic in Latvia, January 2025-December 2025 164

Table 7.16. Core general online marketplaces (seller side) by share of traffic in Latvia, January 2025-December 2025 166

Table 7.17. All general online marketplaces (seller side) by share of traffic in Latvia, January 2025-December 2025 166

Table 7.18. All general online marketplaces (seller side) by share of traffic in Latvia, November 2025-February 2026 167

Table 7.19. Core general online marketplaces (seller side) by share of traffic in Latvia, November 2025-February 2026 167

Figures 7

Figure 2.1. Logistics and delivery supply chain 28

Figure 4.1. E-commerce sales as a percentage of total business turnover in Latvia, Lithuania, Poland and EU average 2015-2025 56

Figure 4.2. Percentage of individuals that made a purchase online in the past 12 months in Latvia, Lithuania and Poland, 2010-2025 57

Figure 4.3. Marketplace revenue of Polish online marketplace Allegro, 2017-2024 61

Figure 4.4. Revenue of Polish online marketplace Allegro, by service, 2017-2024 61

Figure 4.5. Revenue of Lithuanian online marketplaces Pigu and Varle, 2018-2023 71

Figure 4.6. Monthly engaged visits to Temu's website from users based in Lithuania, August 2022-January 2026 77

Figure 4.7. Revenue of Latvian online marketplace Pigu (220.lv), 2018-2023 79

Figure 4.8. Monthly engaged visits to Temu's website from users based in Latvia, August 2022-January 2026 81

Figure 6.1. Ratio of monthly visits to unique visitors (Panel A) and bounce rate (Panel B) for Allegro and Temu's websites, Poland, May 2023-January 2026 131

Figure 6.2. User retention rate for Allegro and Temu's apps, Poland, January 2025-December 2025 132

Figure 7.1. Core general online marketplaces (consumer side) by share of traffic in Poland, July 2022-January 2026 149

Figure 7.2. All general online marketplaces (consumer side) by share of traffic in Poland, July 2022-January 2026 151

Figure 7.3. Core general online marketplaces (consumer side) by share of traffic in Lithuania, August 2022-January 2026 157

Figure 7.4. All general online marketplaces (consumer side) by share of traffic in Lithuania, August 2022-January 2026 158

Figure 7.5. Core general online marketplaces (consumer side) by share of traffic in Latvia, July 2022-January 2026 163

Figure 7.6. All general online marketplaces (consumer side) by share of traffic in Latvia, July 2022-January 2026 164

Figure 7.7. Audience overlap across the top 5 online marketplaces, Poland 170

Figure 7.8. Overlap in website audience between key online marketplaces and retailers, April-September 2025 175

Figure 7.9. The leading platform's share of traffic in core general online marketplaces from the consumer side (Panel A) and from the seller side (Panel B),... 191

Boxes 9

Box 3.1. National competition law and enforcement actions undertaken in Poland over the last five years within the relevant sector 38

Box 3.2. Platform-to-Business regulation 42

Box 6.1. Competition authorities' approaches to market definition and market shares in online marketplaces 125

Box 7.1. Temu's traffic spike in Poland (March-April 2025) 152

Box 7.2. Key Antitrust Decision in the E-commerce Sector on the Use of Competitors' Data 187

Box 8.1. The Amazon case - Asymmetry of power and hybrid platform risks 211

Box 10.1. Digital markets monitoring: international experience 235

Box 10.2. The use of sectoral codes of conduct 241

Appendix Tables 9

Table A A.1. Market share scenarios 246

Table A A.2. Formulas used for market share calculations 248