Competition Policy and Digital Assets: Monopoly, Network Effects, and Crypto Market Structure

Competition policy — antitrust law, market structure regulation, and the broader framework for preventing monopolistic harm — has been conspicuously absent from crypto regulatory debates. The major legislative frameworks, MiCA in the EU and the CLARITY Act in the US, focus on investor protection, market integrity, and financial stability. They are largely silent on market structure questions: whether crypto markets are sufficiently competitive, whether dominant players exploit market power, and whether current concentration levels harm consumers and innovation.

This omission is not innocent. Digital asset markets exhibit structural features that competition economists associate with natural monopoly and winner-take-all outcomes. Addressing these features requires tools that financial regulation does not provide.

The Concentration Facts

The stablecoin market is dominated by Tether’s USDT, which consistently holds more than 70% of stablecoin market capitalisation. Tether’s dominance is self-reinforcing: USDT is the most liquid stablecoin, therefore it is used as the base currency for most crypto trading pairs, therefore it maintains its liquidity advantage, therefore alternative stablecoins struggle to compete.

This concentration is not benign. Tether operates with minimal transparency — its reserve disclosures have been contested, it was fined by the CFTC and the New York Attorney General for misrepresenting its reserves, and its auditing arrangements have historically been opaque. A single issuer controlling 70% of the stablecoin market while operating with limited transparency and regulatory oversight is a market structure concern of the first order.

Centralised exchange concentration follows similar patterns. While the absolute leader has shifted over time — Binance’s dominance reduced after its November 2023 regulatory settlement — the top three or four exchanges consistently capture the majority of global spot trading volume. Exchange network effects are powerful: traders go where liquidity is deepest, liquidity is deepest where traders are, and the largest exchange attracts the most pairs, the most market makers, and the lowest spreads.

Blockchain platform concentration is perhaps the most analytically interesting dimension. Ethereum’s dominance in smart contract platforms for tokenization is overwhelming. Layer 2 activity sits atop Ethereum. Major tokenized real-world asset projects favour Ethereum or Ethereum-compatible chains. The network effects of Ethereum — the largest developer ecosystem, the deepest DeFi liquidity, the most institutional integrations — create an incumbency advantage that has proven durable despite the proliferation of competing platforms.

Why Network Effects Produce Concentration

Digital markets generate network effects — the value of a product increases as more users adopt it — more powerfully than almost any other market type. In financial markets, liquidity is the primary network effect. A market with more participants has tighter bid-ask spreads, lower price impact for large orders, and faster settlement. These advantages compound: more participants create better liquidity, which attracts more participants.

This dynamic means that crypto market concentration is not primarily the result of anticompetitive behaviour — though such behaviour may compound it. It is the natural result of liquidity network effects operating in markets where transaction costs and barriers to switching are low enough that liquidity differentials determine market choice.

The policy implication is uncomfortable: crypto markets may tend toward concentration regardless of competitive behaviour, because the efficiency benefits of concentrated liquidity are real. Breaking up a dominant exchange or stablecoin issuer might reduce consumer welfare by fragmenting liquidity, even if it increases the number of competitors.

This does not mean competition policy is irrelevant. It means the relevant policy questions are different from standard antitrust: not “are these firms too large?” but “do dominant firms use their market position to exclude competitors in ways that harm consumers beyond the natural concentration that network effects produce?”

The Competition Policy Vacuum

The SEC and CFTC are primarily investor protection and market integrity regulators. They have authority to prevent market manipulation and fraud, but they do not have general antitrust authority. The Department of Justice and Federal Trade Commission have antitrust authority but limited domain expertise in financial markets and no specific crypto mandate.

This institutional fragmentation means that crypto market structure questions fall through the gaps. No US regulator is systematically asking whether Tether’s dominance is anticompetitive, whether exchange concentration harms retail traders, or whether blockchain platform concentration creates barriers to innovation.

Europe’s competition enforcement — led by the European Commission’s DG Competition — is more active but similarly focused on platform markets under the Digital Markets Act (DMA) rather than financial markets specifically. The DMA’s “gatekeeper” designation applies to large digital platforms based on user numbers and market capitalisation. Large crypto exchanges that meet the thresholds could theoretically be designated as gatekeepers, imposing interoperability requirements and restrictions on self-preferencing. This analysis has not yet been comprehensively applied to crypto.

Tether: Competition and Systemic Risk Combined

Tether’s dominance is not merely a competition concern — it is a combined competition and systemic risk concern. A company with 70%+ market share in an infrastructure-critical asset class, operating with limited transparency, without meaningful regulatory oversight in a major jurisdiction, and with opaque reserve management, represents an unusual concentration of financial risk.

The controversy around Tether’s reserves — whether USDT is fully backed by high-quality liquid assets or partially backed by commercial paper, crypto loans, and other less liquid instruments — matters precisely because of its market dominance. If USDT faced a serious reserve crisis, the stablecoin market would face acute stress. The resulting pressure on crypto trading — which uses USDT as its primary pricing currency — could be severe.

This is the intersection of competition and systemic risk that financial regulation alone cannot address: a dominant market position that amplifies the systemic consequences of any firm-specific failure.

Would More Competition Improve Stability?

The obvious response to Tether’s dominance is to promote competition: multiple large stablecoins, multiple exchanges, multiple blockchain platforms. More competition, lower concentration, less dependence on any single actor.

This response has merit as a long-run policy objective but raises shorter-run stability questions. More stablecoin providers means more reserve management operations that could each face runs. More exchanges means more custody operations that could each face insolvency. Fragmented liquidity means wider spreads and more volatile prices for all participants.

The most plausible stability-improving competitive outcome is not maximally fragmented markets but competitive markets with two or three well-regulated providers rather than one dominant but lightly regulated incumbent. This is the logic behind MiCA’s stablecoin provisions, which create a compliance pathway that could support Circle’s USDC as a regulated Tether alternative in European markets — not atomistic competition but competitive discipline on the dominant player.

Competition policy for digital assets is not about applying standard antitrust to markets that happen to use blockchain technology. It requires understanding what specific competition failures digital asset markets are prone to, designing interventions calibrated to those failures, and building regulatory capacity to monitor market structure over time. None of this exists yet. That gap is overdue for closing.