Global Liquidity Alone Cannot Sustain a Crypto Rally

Cryptocurrency investors often reduce monetary policy to a straightforward rule: when central banks make money more plentiful, prices rise. That explanation has intuitive appeal. Lower funding costs encourage risk-taking, investors search for higher returns, and additional capital moves into assets such as Bitcoin (BTC ), Ethereum (ETH ), and Solana (SOL ).

New research published¹ in the Journal of Financial Stability suggests that this relationship is real, but incomplete. Excess liquidity was associated with substantially higher cryptocurrency returns between 2019 and 2024. However, the strength of that relationship depended on another condition that receives less attention: economic policy uncertainty.

When uncertainty increased, the apparent benefit of surplus liquidity weakened considerably. The implication is that capital availability and investor confidence must work together. Central banks can create favorable financial conditions, but they cannot force investors to embrace risk when the policy environment appears unstable.

How Excess Liquidity Can Reach Cryptocurrency Markets

Liquidity describes the amount of money and credit available throughout the financial system. Excess liquidity develops when that availability rises beyond the level suggested by underlying economic conditions.

The study estimated excess liquidity by comparing actual conditions in the United States and China with equilibrium levels derived from macroeconomic variables. Instead of treating liquidity as a continuously changing quantity, the researchers classified each month as either an excess-liquidity regime or a normal regime.

This distinction matters because excess liquidity can alter investor behavior. When capital is plentiful, borrowing constraints can loosen and safe assets may offer less attractive returns. Investors consequently become more willing to move outward along the risk spectrum.

Cryptocurrencies are natural recipients of this behavior. They trade continuously, are globally accessible, and can experience sharp price movements when new capital enters the market. Recent analysis of what motivates Americans to invest in cryptocurrency also shows that participation depends on more than technology or ideology. Market conditions and risk appetite remain central to adoption.

The researchers identified two primary routes through which surplus capital may reach crypto:

• Greater tolerance for speculative risk
• Stablecoin-supported trading and arbitrage

The first route is behavioral. Investors with access to abundant capital may perceive less downside risk and become more comfortable holding volatile assets. The second is structural. Stablecoins provide the digital cash used to settle trades, transfer capital between platforms, and exploit price differences across markets.

What The Study Found About Crypto Returns

The researchers examined monthly data from January 2019 through December 2024. The sample included Bitcoin, Ethereum, XRP, BNB, and Solana, along with USDT, USDC, DAI, TUSD, and EURS. Together, these assets produced 720 coin-month observations.

US excess-liquidity regimes were associated with a 12.1-percentage-point increase in average monthly cryptocurrency returns. Rising US economic policy uncertainty reduced the estimated liquidity premium by approximately 54%.

Chinese excess liquidity was associated with a 9.3-percentage-point increase in returns. However, the interaction with rising Chinese policy uncertainty was negative 13.8 percentage points, more than offsetting the positive baseline association.

These are unusually large estimates, but they should not be interpreted as guaranteed monthly gains or as evidence that monetary expansion directly caused cryptocurrency prices to rise. They represent differences between observed macroeconomic regimes after accounting for several other variables.

Why Policy Uncertainty Can Neutralize Easy Money

Economic policy uncertainty measures concern about the future direction of monetary, fiscal, trade, and regulatory policy. Investors may have access to ample capital while remaining unwilling to deploy it if they cannot estimate how policy decisions will affect their positions.

This produces two opposing forces. Excess liquidity reduces financial constraints and encourages risk-taking. Policy uncertainty raises perceived risk and increases the value of waiting.

The resulting hesitation can be especially important in cryptocurrency markets. Regulatory announcements can alter exchange access, stablecoin rules, custody requirements, taxation, or the legal status of particular assets. Investors therefore face risks that extend beyond conventional questions about interest rates and economic growth.

Related research has found that monetary policy uncertainty affects cryptocurrency market uncertainty, with transmission changing considerably over time. This supports a broader conclusion: liquidity indicators cannot be evaluated separately from the policy environment surrounding them.

The Federal Reserve also treats communication as part of its monetary policy strategy and toolkit. Predictable communication can reduce uncertainty about future conditions, while contradictory guidance can weaken the confidence required for capital to move into risky assets.

Stablecoins Are The Transmission Layer, Not The Rally

Stablecoins occupy a particularly interesting position in this framework. Their prices are designed to remain close to a reference currency, so their returns naturally respond less than those of Bitcoin or Ethereum. Their importance comes from what they enable rather than how much their own prices appreciate.

Stablecoins allow traders to move value between exchanges, hold dollar-denominated purchasing power onchain, and complete transactions without returning to the banking system after every trade. When demand rises, this infrastructure can help surplus fiat liquidity circulate through digital asset markets more efficiently.

That does not mean stablecoin issuance automatically creates a crypto rally. It is more accurate to think of stablecoins as financial plumbing. Plumbing can increase the speed and capacity of capital flows, but it does not determine whether investors want to take risk.

This distinction also helps reconcile the study with research suggesting that stablecoin issuance can follow crypto demand rather than initiate it. Stablecoins may amplify or accommodate market activity while still depending on confidence, regulation, and investor appetite.

The issue has become increasingly relevant as policymakers consider whether Federal Reserve access could make stablecoins safer. Better reserve safeguards may improve confidence in the transmission layer, but stronger infrastructure cannot eliminate the effects of wider economic uncertainty.

The Bank for International Settlements has similarly warned that broader stablecoin adoption could complicate monetary policy transmission. Stablecoins do not normally pay policy-linked interest directly, but rate changes can still affect the opportunity cost of holding them and the economics of the companies issuing them.

Why Chinese Liquidity Still Matters To Global Crypto

The Chinese findings are notable because domestic cryptocurrency trading faces extensive restrictions. If legal access were the only transmission channel, Chinese monetary conditions should have limited relevance to global crypto returns.

Instead, the results suggest that liquidity can travel indirectly through offshore financial centers, peer-to-peer markets, international investors, and stablecoin settlement. Capital does not need to move directly from a Chinese bank account to a domestic cryptocurrency exchange for Chinese financial conditions to influence global risk appetite.

Policy uncertainty also had a stronger moderating relationship in China than in the United States. This may reflect the more episodic nature of Chinese liquidity support and the difficulty of predicting regulatory intervention. Surplus liquidity can exist while investors remain uncertain about where it can be deployed or whether restrictions will tighten.

This reinforces the global nature of cryptocurrency valuation. Investors watching only the Federal Reserve may miss liquidity and uncertainty signals originating from the world’s second-largest economy.

A Better Framework For Reading Crypto Market Cycles

The study offers a more useful framework than the familiar claim that money printing makes Bitcoin rise. Investors need to distinguish between liquidity creation, liquidity transmission, and asset demand.

First, financial conditions must become sufficiently loose to create surplus capital. Second, markets need functioning channels through which that capital can enter digital assets. Third, investors must be confident enough to accept cryptocurrency risk.

A breakdown at any stage can weaken the expected response. A central bank may loosen policy while commercial lenders remain cautious. Stablecoin infrastructure may expand while investors prefer cash or government bonds. Crypto regulation may improve while high interest rates continue to reward defensive positioning.

This framework also explains why apparently favorable monetary announcements do not always generate lasting rallies. Markets price anticipated policy changes before they occur, and easing introduced during a severe economic disruption may be accompanied by enough uncertainty to offset its benefits.

For practical analysis, measures such as money supply, real interest rates, central-bank balance sheets, stablecoin circulation, exchange funding conditions, leverage, and policy uncertainty should be considered together. No single indicator provides a complete market signal.

Investing In The Stablecoin Liquidity Layer

For investors seeking equity exposure to this developing infrastructure, Circle Internet (CRCL ) Group offers a direct connection to the stablecoin transmission channel examined by the study. Circle issues USDC and EURC, which are used for trading, payments, settlement, and onchain financial applications.

Circle reported that its 2025 reserve income increased alongside substantial growth in average USDC circulation. This demonstrates how greater stablecoin adoption can translate into corporate revenue rather than merely expanding token supply.

However, Circle is not a simple bet on rising cryptocurrency prices. Its economics contain a significant tension. Greater crypto activity can increase demand for USDC, while lower interest rates can reduce the yield earned on the assets backing that USDC. Conversely, higher rates may improve reserve income while restrictive liquidity conditions weigh on crypto participation.

This makes Circle relevant precisely because the investment case reflects the same competing forces identified by the researchers. Its performance may depend on the amount of digital dollars in circulation, the interest earned on reserves, regulatory requirements, distribution expenses, and the ability of USDC to remain trusted during periods of uncertainty.

Liquidity Matters Most When Investors Trust The Environment

The study does not establish a formula for predicting cryptocurrency returns. Its sample covers a volatile six-year period, its principal variables are divided into binary regimes, and its models cannot capture every force affecting individual assets.

Nevertheless, the central insight is valuable. Excess liquidity creates the potential for stronger crypto demand, but confidence determines whether that potential is realized. Stablecoins can transport capital efficiently, yet they cannot compel investors to take risk.

For investors, the clearest conclusion is that monetary easing should never be interpreted in isolation. The most supportive environment for cryptocurrency is not simply abundant money. It is abundant money moving through reliable infrastructure during a period when investors understand and trust the direction of policy.

References:

1 Nguyen, T. C., Nguyen, T. V. H., Nguyen, T., & Nguyen, B. T. (2026). Excess liquidity, cryptocurrency returns, and the moderating role of economic policy uncertainty. Journal of Financial Stability, 101587. https://doi.org/10.1016/j.jfs.2026.101587