Central Banks as Market Makers of Last Resort: The $830 Billion Moral Hazard Problem

The Wall Street Journal's James Mackintosh, in an August 2026 analysis, argues that central banks have fundamentally changed their role in financial markets. By becoming market makers of last resort during the 2008 crisis and again in 2020, they have created a system where emergency facilities designed to prevent crises are now sowing the seeds of the next one . The core problem: these interventions subsidize government borrowing, pump up leverage and risk, and may even interfere with monetary policy . Policymakers inside central banks are increasingly worried about a "rinse-and-repeat cycle" where each intervention builds the foundation for the next crisis .

How Hedge Fund Basis Trades Illustrate the Risk

The Treasury cash-futures basis trade is the clearest example of this dynamic in action. In this arbitrage strategy, hedge funds buy cash Treasuries and short Treasury futures to capture small price discrepancies. As of September 2025, those positions had grown to approximately $830 billion—about double the previous peak in early 2020 and representing 35% of hedge funds' total long Treasury exposures .

These trades are financed almost entirely by borrowing in repurchase agreements, making them deeply vulnerable to sudden margin spirals . The Fed's May 2026 Financial Stability Report confirmed that hedge fund leverage "remained stable at record-high levels" . The sheer size of the positions means a forced unwinding could destabilize the $29 trillion Treasury market .

The Moral Hazard Loop

The risk is compounded by moral hazard. A March 2025 Brookings Institution paper by Kashyap, Stein, Wallen, and Younger proposed that the Fed create a facility to backstop hedge funds' basis trades during periods of extreme stress, essentially taking on the positions being unwound . The logic is that direct, targeted intervention is less disruptive than broad market purchases. But the WSJ and other analysts note the acute moral hazard: as one risk analyst summarized the proposal, "Moral hazard is a natural concern for a policy which removes the main risk that hedge funds face when taking leveraged positions in cash-futures basis" . The Congressional Research Service also warns that any new federal backstops must be evaluated "while maintaining awareness of moral hazards" . The FDIC's own research confirms "the moral hazard consequences of emergency lending" .

The dynamic is self-reinforcing. The expectation of a safety net encourages even larger, more levered positions. Those positions grow so large that they become systemically dangerous. The only politically palatable response is yet another emergency facility—which then fuels even more leverage next time.

The Search for More Targeted Models

Policymakers and economists are exploring narrower tools to break this cycle:

• A narrow Fed backstop facility that would only step in during extreme stress to take on hedge fund positions being unwound, avoiding broad market purchases .
• Over-collateralization requirements (higher haircuts) on repo financing to directly curtail excessive basis-trade leverage .
• Mandating central clearing in Treasury markets to improve risk transparency and reduce the buildup of hidden leverage .
• Utilizing the Treasury's buyback program as a more surgical liquidity tool .

Each of these approaches reflects a recognition that the broad-brush market-maker-of-last-resort role has backfired. But every proposed fix carries its own version of the same fundamental tradeoff: how to provide enough stability to prevent disorderly market dislocations without encouraging the risk-taking that makes those dislocations more likely.

The Bottom Line

The WSJ's central warning is not that emergency lending is inherently wrong, but that the shift from acting as a lender of last resort to a market maker of last resort has fundamentally changed incentives. The safety net now reaches into the most levered corners of the financial system. Until policymakers break the cycle with a more targeted approach, each crisis response will lay the groundwork for the next.