Introduction
E-commerce and online marketplaces have become central to commercial life in Turkey. Online platforms now connect sellers, consumers, payment service providers, logistics companies, advertisers, software developers and data-driven business models. This digital transformation has created major commercial opportunities, but it has also increased competition law risks for online marketplaces, e-commerce retailers, brands, distributors, technology platforms and foreign investors operating in Turkey.
The main statute is Law No. 4054 on the Protection of Competition. The law prohibits anti-competitive agreements, concerted practices and decisions of associations of undertakings under Article 4; abuse of dominant position under Article 6; and certain mergers and acquisitions that may significantly lessen effective competition under Article 7. Article 4 expressly covers conduct such as price fixing, market allocation, supply restriction, discriminatory terms and tying arrangements, while Article 6 prohibits abuse of dominance in a market for goods or services within Turkey.
For e-commerce companies, Turkish Competition Law is not limited to classic cartels. It also applies to platform rules, seller access, online sales restrictions, resale price maintenance, marketplace bans, parity clauses, algorithmic pricing, use of seller data, self-preferencing, platform exclusivity, digital advertising practices, data sharing and online distribution systems. Therefore, companies operating in Turkish digital markets should treat competition compliance as a core part of their business strategy.
1. Why E-Commerce Is a Competition Law Priority in Turkey
Digital markets have specific features that make competition law analysis more complex than in traditional markets. Online marketplaces often benefit from network effects: the more sellers a platform has, the more attractive it becomes for consumers; the more consumers it has, the more attractive it becomes for sellers. This can create rapid concentration and make it difficult for new platforms to compete.
The Turkish Competition Authority has recognized that e-marketplace platforms differ significantly from traditional markets and that fast concentration in these markets may give platforms market power that is difficult for actual or potential competitors to challenge. In its OECD submission on potential competition, the Authority referred to its e-marketplace sector inquiry and noted concerns about structurally high entry barriers and the need for strict and careful enforcement in platform markets.
This means that an online marketplace in Turkey may face competition scrutiny even where its business model appears innovative or consumer-friendly. Market power may arise not only from market share but also from data, user base, seller dependency, logistics integration, payment infrastructure, advertising tools, ranking systems and ecosystem control.
2. Article 4 Risks: Agreements Restricting Online Competition
Article 4 of Law No. 4054 prohibits agreements and concerted practices that restrict competition. In the e-commerce context, this provision may apply to agreements between competitors, agreements between suppliers and online sellers, marketplace rules imposed on business users, trade association practices and indirect coordination through digital tools.
High-risk Article 4 conduct may include coordination between online retailers on prices, agreement between sellers not to discount, allocation of customer groups, bid rigging in online procurement, exchange of future pricing information, and platform-facilitated coordination between competing sellers.
Article 4 also applies to vertical agreements. For example, a supplier may violate competition law if it restricts an online seller’s freedom to determine resale prices, prevents sales through online channels, imposes unjustified marketplace bans, or restricts passive sales to customers who independently approach the seller. Law No. 4054 expressly identifies fixing sale prices and allocation of markets or customers as prohibited examples.
3. Resale Price Maintenance in E-Commerce
Resale price maintenance is one of the most common risks in online commerce. It occurs when a supplier directly or indirectly restricts a reseller’s ability to determine resale prices. In e-commerce, RPM risk is particularly high because suppliers can easily monitor online prices through marketplace dashboards, price comparison websites, screenshots, bots and automated tracking software.
The Turkish Competition Authority’s SME guidance explains that preventing a dealer or distributor from freely determining resale prices may constitute a competition infringement and that this may happen directly through contract clauses or indirectly through mechanisms such as determining the purchaser’s profit margin.
For e-commerce businesses, the following practices are risky:
A supplier tells sellers not to sell below a certain online price.
A brand warns a marketplace seller to “correct” its discount.
A distributor reduces stock supply because a reseller sells cheaply online.
A supplier conditions bonus payments on compliance with recommended prices.
A brand collects complaints from offline dealers and pressures online sellers.
A sales manager monitors marketplace prices and threatens termination.
Recommended resale prices are not automatically unlawful, but they must remain genuinely non-binding. If a recommended price becomes enforced through pressure, warnings, penalties, supply restrictions or bonus reductions, it may be treated as RPM.
4. Online Sales Restrictions and Marketplace Bans
Suppliers often want to control online sales to protect brand image, product quality, authorized distribution standards and customer experience. Turkish competition law allows suppliers to impose objective quality standards in appropriate cases, but these standards must not effectively prevent online sales.
The Turkish Competition Authority’s Guidelines on Vertical Agreements state that conditions imposed on online sales must not directly or indirectly aim to prevent online sales by distributors. The same guidelines also explain that suppliers may require buyers to sell only through sales platforms or marketplaces that meet certain standards, but such restrictions must not aim to prevent online sales or price competition. A general prohibition of sales over platforms without objective, uniform and product-specific justifications may be assessed as a violation.
This is highly relevant for brands selling through Turkish marketplaces. A blanket ban on all marketplace sales may be risky unless it is supported by objective and proportionate reasons. Instead of imposing a total ban, a supplier may consider objective marketplace criteria such as authenticity controls, customer service standards, delivery rules, warranty information, product presentation, consumer complaint handling and brand protection measures.
5. Selective Distribution and Online Channels
Selective distribution systems are common in sectors such as luxury goods, cosmetics, electronics, medical devices, consumer appliances and branded products. In such systems, the supplier appoints authorized sellers based on qualitative or quantitative criteria.
Selective distribution may be lawful if criteria are objective, proportionate, transparent and applied uniformly. However, selective distribution cannot be used as a disguised method to eliminate online competition. Online sales criteria should serve legitimate goals such as quality, safety, brand image or customer service, and they should not prevent internet sales in practice.
The Guidelines on Vertical Agreements emphasize that online sales conditions should be objectively concrete, reasonable and acceptable in terms of factors such as improving distribution quality, brand image and efficiency. They also refer to the principle of equivalency: criteria for physical and online channels do not need to be identical, but they should serve the same goal and should not discourage the use of the internet.
6. Platform Dominance and Article 6 Risks
Article 6 of Law No. 4054 prohibits abuse of dominant position. Dominance itself is not unlawful. A platform may become large because it offers better services, lower prices, reliable logistics, secure payment systems or superior technology. However, a dominant platform must not abuse its market power.
Law No. 4054 defines dominant position as the power of one or more undertakings in a particular market to determine economic parameters such as price, supply, production and distribution by acting independently from competitors and customers.
In e-commerce, dominance may arise from market share, network effects, data advantages, seller dependency, consumer loyalty, logistics integration, switching costs, payment systems, advertising infrastructure and control over search or ranking. A dominant online marketplace may face scrutiny if it excludes rivals, discriminates against business users, uses seller data unfairly, imposes unfair terms, restricts access, applies self-preferencing or leverages its power into neighboring markets.
7. Self-Preferencing and Use of Seller Data
Self-preferencing is one of the most important digital competition law risks. It occurs when a platform gives preferential treatment to its own products, services or affiliates over third-party business users that depend on the platform.
For example, a marketplace may operate both as a platform and as a seller. If it uses non-public seller data to identify successful products and then promotes its own competing products through better ranking, lower commissions, advertising advantages or algorithmic preference, competition concerns may arise.
The Turkish Competition Authority’s digital transformation report discusses the Dolap/Trendyol matter. It states that the Board considered commitments submitted by DSM Grup Danışmanlık İletişim ve Satış Tic. AŞ capable of addressing concerns relating to allegations that Trendyol leveraged its position in the multi-category online marketplace to support Dolap in the online second-hand goods sales market by using consumer data and financial strength, and the Board made the commitment package binding while terminating the investigation.
This example shows that data use, ecosystem leverage and platform integration are central issues in Turkish digital competition law.
8. Data as a Source of Market Power
Data is one of the most valuable assets in e-commerce. Marketplaces collect data about search behavior, product views, basket abandonment, sales conversion, pricing, customer reviews, seller performance, logistics, returns and advertising effectiveness. This data can improve platform services, but it can also create competition concerns.
A platform that controls large volumes of non-public seller and consumer data may gain an advantage over rivals. Data may strengthen network effects, improve algorithms, support targeted advertising, identify profitable product categories and increase switching costs. If a dominant platform uses data in a way that excludes competitors or unfairly disadvantages business users, Article 6 concerns may arise.
Data-related competition risk is not the same as personal data protection risk, but the two areas often overlap. A practice may comply with data protection rules but still create competition concerns if it strengthens market power or forecloses competitors.
9. Parity Clauses and Most-Favored-Nation Clauses
Parity clauses, also known as most-favored-nation clauses, may require sellers not to offer better prices or conditions on other platforms, their own websites or offline channels. These clauses are common in online marketplaces, hotel booking platforms, delivery platforms, app stores and digital services.
A narrow parity clause may prevent a seller from offering lower prices on its own website. A wide parity clause may prevent the seller from offering lower prices on any other platform. Both can raise competition concerns depending on market power, scope, duration and market effects.
In e-commerce, parity clauses may reduce price competition between platforms, make it harder for new platforms to attract sellers, increase commission levels and restrict sellers’ commercial freedom. A dominant marketplace using broad parity clauses may face greater scrutiny because sellers may have no realistic alternative but to accept the clause.
10. Algorithmic Pricing and Digital Collusion
Algorithmic pricing is increasingly common in e-commerce. Sellers may use software to adjust prices according to demand, competitor prices, inventory levels, exchange rates, campaign periods and marketplace rankings. These tools can increase efficiency, but they can also create competition law risks.
If competing sellers use algorithms to coordinate prices, reduce uncertainty or align commercial behavior, Article 4 risks may arise. The risk is higher where sellers use a common pricing tool, share sensitive information through a third-party service provider, or configure algorithms to match competitors’ prices automatically.
Algorithmic collusion does not require old-fashioned secret meetings. The key question is whether independent pricing behavior has been replaced by coordination. Companies using pricing software should ensure that their tools do not rely on unlawful competitor information, do not implement coordinated pricing and do not facilitate market-wide alignment.
11. Advertising Restrictions and Search Visibility
Online marketplaces often control search rankings, sponsored ads, product visibility, recommendation systems and “buy box” placement. These tools determine which sellers are seen by consumers and which products receive sales opportunities.
A marketplace may legitimately use ranking criteria such as relevance, price, delivery time, seller rating, stock availability and customer satisfaction. However, competition concerns may arise if ranking is manipulated to favor the platform’s own products, affiliated sellers or sellers paying higher fees without transparency.
Advertising restrictions imposed by suppliers may also raise competition risks. For example, a supplier that prevents resellers from using online advertising, search ads or price comparison tools may restrict online sales and price competition. According to the Turkish Competition Authority’s 2024 Annual Report, investigations examined restrictions on resellers’ online or marketplace sales and restrictions preventing resellers from advertising or using price comparison websites.
12. Hub-and-Spoke Risks in Online Marketplaces
Online marketplaces may unintentionally or intentionally facilitate coordination between sellers. This is known as hub-and-spoke risk. The platform acts as a hub, while competing sellers are the spokes.
Risk may arise if the platform shares competitively sensitive seller information, communicates one seller’s pricing intentions to another, encourages sellers to align prices, or uses marketplace rules to discipline discounting sellers. Hub-and-spoke concerns may also arise where a supplier uses a marketplace or distributor network to enforce resale price discipline among competing retailers.
A marketplace should avoid becoming a channel for seller coordination. It should not share future pricing, non-public sales data, campaign plans or stock strategies between competing sellers. Seller dashboards and analytics tools should be designed carefully to avoid facilitating coordination.
13. Abuse of Dominance in Digital Markets
The Turkish Competition Authority has expressly recognized the increasing importance of abuse of dominance cases in digital markets. In its OECD contribution on abuse of dominance in digital markets, the Authority stated that applications and examinations concerning dominance in digital markets had increased and made up a significant part of the workload of the relevant enforcement department.
Potential abuses in e-commerce may include:
Self-preferencing by a dominant marketplace.
Discriminatory ranking or access rules.
Refusal to provide access to essential platform infrastructure.
Excessive or unfair commission terms.
Use of seller data to compete against sellers.
Tying logistics, payment or advertising services to marketplace access.
Exclusivity obligations preventing multi-homing.
Predatory pricing to eliminate smaller platforms.
Restricting interoperability or data portability.
Each case requires market-specific analysis. The question is not simply whether a platform is large, but whether its conduct harms the competitive process.
14. Merger Control for E-Commerce and Technology Transactions
E-commerce transactions may also trigger Turkish merger control rules. Acquisitions of online marketplaces, software companies, fintech businesses, logistics platforms, digital advertising companies, data-driven services and marketplace aggregators should be screened under Turkish merger control.
Digital acquisitions can raise concerns about potential competition. A dominant platform acquiring an emerging rival, niche marketplace or innovative technology company may eliminate future competitive pressure. The Turkish Competition Authority has stated that potential competition has gained prominence globally in the context of mergers and acquisitions in digital and pharmaceutical sectors.
Foreign investors should not assume that a transaction is irrelevant to Turkey because the target is not incorporated in Turkey. If the transaction affects Turkish markets or meets applicable thresholds, Turkish notification requirements may arise.
15. Marketplace Sellers’ Rights and Competition Law
Marketplace sellers are not merely commercial users; they may also be affected by competition law violations. Sellers may face unfair access terms, discriminatory treatment, unjustified account suspensions, non-transparent ranking, forced use of logistics or advertising tools, unfair data practices or parity obligations.
A seller harmed by anti-competitive conduct may consider filing a complaint before the Turkish Competition Authority. If the conduct causes measurable loss, private damages claims may also be considered under Law No. 4054. The law provides private law consequences for competition restrictions, including invalidity of agreements contrary to Article 4 and compensation liability for those who restrict competition or abuse dominance.
From a platform perspective, fair and transparent seller governance reduces both legal risk and commercial conflict. Clear criteria for suspension, ranking, commissions, advertising, data access and logistics requirements can reduce competition concerns.
16. Consumer Welfare in Online Markets
Competition law ultimately protects the competitive process and consumer welfare. In e-commerce, consumer harm may appear in different ways. It may include higher prices, reduced discounts, fewer sellers, lower product variety, reduced innovation, worse service quality, limited data portability, less transparency or reduced choice between platforms.
Some digital practices may appear beneficial in the short term but harmful in the long term. For example, aggressive below-cost pricing may benefit consumers initially but may eliminate smaller platforms and later lead to higher prices or fewer options. Similarly, a dominant marketplace may offer convenience but restrict seller independence or reduce inter-platform competition.
Competition analysis in digital markets therefore requires attention to both immediate consumer benefits and long-term market structure.
17. Administrative Fines and Enforcement Consequences
E-commerce companies violating Turkish Competition Law may face serious sanctions. Under Law No. 4054, undertakings that violate Articles 4, 6 or 7 may face administrative fines of up to 10% of annual gross revenues. Managers or employees who had decisive influence in the infringement may also face personal fines of up to 5% of the fine imposed on the undertaking.
The Board may also order undertakings to terminate unlawful conduct, amend contracts, change platform rules, remove restrictions, provide access, implement commitments or take measures to restore competition. In suitable cases, commitment mechanisms may be used, but commitments are not accepted for naked and hardcore infringements such as price fixing between competitors, region or customer allocation and supply restriction.
18. Compliance Program for E-Commerce Companies
A Turkish competition compliance program for e-commerce businesses should be practical and sector-specific. Generic antitrust policies are not enough for digital markets.
An effective program should cover:
Seller access and suspension rules.
Use of seller and consumer data.
Ranking and search algorithms.
Sponsored product and advertising rules.
Resale price maintenance risks.
Online sales and marketplace restrictions.
MFN and parity clauses.
Platform exclusivity and multi-homing.
Algorithmic pricing tools.
Competitor contacts and information exchange.
M&A screening for technology acquisitions.
Dawn raid preparedness and digital data review.
Employee training for sales, category, product, legal and data teams.
The compliance program should be supported by senior management and regularly audited. E-commerce businesses change quickly; compliance review should therefore be continuous, not one-time.
19. Practical Drafting Tips for Online Marketplace Agreements
Marketplace agreements should be drafted with competition law risk in mind. Terms should be transparent, objective and proportionate. Commission rules, ranking criteria, suspension grounds, data usage provisions, advertising rules, logistics requirements and seller obligations should be clear.
Suppliers drafting online sales policies should avoid broad marketplace bans unless they are supported by objective and uniform criteria. Resale prices should remain independently determined by sellers. Recommended prices should be clearly non-binding. Restrictions on online advertising, price comparison tools or marketplace sales should be reviewed carefully.
Platforms should avoid using contract terms that unnecessarily restrict sellers from using competing platforms. They should also be cautious with parity clauses, exclusive arrangements and mandatory bundled services.
20. Conclusion
Turkish Competition Law is highly relevant for e-commerce companies and online marketplaces. Law No. 4054 applies to digital platforms, marketplace operators, sellers, suppliers, distributors, advertisers, technology companies and foreign investors whose conduct affects Turkish markets. Article 4 prohibits restrictive agreements and concerted practices, while Article 6 prohibits abuse of dominant position. These rules apply with full force to digital markets.
The main competition risks in Turkish e-commerce include resale price maintenance, online sales restrictions, unjustified marketplace bans, parity clauses, self-preferencing, discriminatory ranking, misuse of seller data, platform exclusivity, hub-and-spoke coordination, algorithmic pricing and acquisitions of potential competitors.
The Turkish Competition Authority has already identified e-marketplaces and digital markets as important enforcement areas. Its guidance and reports show that online sales, marketplace restrictions, platform power, data use and potential competition are central issues in Turkish competition policy.
For companies operating in Turkey, the safest approach is proactive compliance. Marketplace agreements, seller policies, online sales rules, data practices, ranking algorithms, pricing tools and acquisition strategies should be reviewed before they create regulatory exposure. A well-designed competition compliance program can reduce investigation risk, protect platform reputation, preserve seller trust and support sustainable growth in Turkey’s digital economy.
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