With U.S. debt hitting $40 trillion, markets are devoting more attention to the burden—and to whether policymakers will address its root causes or merely its symptoms. The Treasury Department's interventions in the bond and currency markets in recent weeks point to the latter.

Treasury Secretary Scott Bessent surprised Wall Street on Wednesday with a plan to increase buybacks of long-term bonds, after the 30-year yield hit its highest level in nearly 20 years. Long-dated Treasury yields serve as benchmarks for borrowing costs across the economy, from mortgages to corporate debt, which is why sustained pressure at that end of the curve attracts particular scrutiny. The Treasury had already been running regular buyback operations since reviving the program in 2024—its first since 2002—though those purchases were framed as support for liquidity in older, off-the-run securities rather than an effort to manage yield levels.

The announcement came just a few weeks after the U.S. and Japan took joint action to boost the yen for the first time in three decades. To carry out that intervention, the U.S. sold euros instead of dollar-denominated assets, avoiding a sale of Treasury securities that would have put further upward pressure on yields.

Japan also refrained from selling Treasuries, instead tapping an obscure Federal Reserve tool called the Foreign and International Monetary Authorities Repo Facility (FIMA). The mechanism allowed Japan, the world's largest holder of U.S. debt, to borrow dollars against its Treasury stockpile, obtaining a limited form of liquidity. The Fed created the facility in March 2020, at the height of pandemic-era market stress, precisely so that foreign official holders could raise dollars without dumping Treasuries onto the market; usage has been sparse ever since.

According to George Saravelos, head of FX research at Deutsche Bank, "we see both the buyback and encouragement to use the FIMA facility for FX reserves as soft-form financial repression policies aimed at containing the long-end of the US yield curve."

Financial repression generally refers to policies that enable a government to keep interest rates artificially low by influencing financial markets. The classic toolkit includes caps on interest rates, rules that steer banks and institutional investors into holding government paper, and inflation that erodes the real value of outstanding debt. Countries throughout history have practiced it, especially in times of high indebtedness. The U.S. and other developed economies used financial repression to slash their debt-to-GDP ratios after World War II.

Conflict and calamity are recurring ingredients. A recent survey of 300 years of U.S. and U.K. history found that wars are "always disaster times" for holders of government debt, because of inflation and financial repression.

The approach carries risks for currencies as well. Saravelos warned that suppressing U.S. Treasury yields would merely shift the impact onto the dollar.

"If the market price of USTs is not 'allowed' to adjust down, the foreign exchange price of UST owned by foreign investors has to adjust via a weakening in the dollar," he explained.

Markets will next scrutinize how the Federal Reserve responds, Saravelos predicted, noting that Bessent's moves to effectively loosen financial conditions would typically prompt the Fed to offset them with tightening measures.

The Fed has been especially wary of inflation, which has exceeded its 2% target for more than five years, and several central bankers have signaled readiness to hike rates. Chairman Kevin Warsh, however, has refrained from so-called forward guidance, leaving Wall Street guessing about his stance.

"If Chair Warsh does not recognize the buyback as a factor driving an easing of financial conditions, we would take it as an additional dollar negative driver," Saravelos added. "In all, the market is likely to be increasingly attentive to further measures intended to support the US Treasury market going forward. The more these are perceived as distortionary to market pricing, the more the dollar is likely to weaken."

Since the debt buyback was unveiled, markets have ramped up bets on the "debasement trade," with prices for gold and bitcoin surging on expectations of further dollar devaluation.

The reaction reflects the fact that the root causes of the recent jump in bond yields—above all, massive debt and deficits—are not priorities among most lawmakers. The federal budget deficit is on track to hit $2 trillion this fiscal year, and interest costs on the debt alone already run at $1 trillion annually—more than the United States spends on national defense—taking up an ever-larger share of spending. There is no sign that Washington is serious about slashing the budget or raising taxes.

Absent such measures, the solution to higher borrowing costs is likely to be more repression. A research paper published last month by the International Monetary Fund argued that the world is ripe for another wave.

"With the conditions historically associated with elevated repression present today, our evidence suggests that financial repression may see increased use going forward," the paper said.

How far these policies extend can be tracked in concrete terms: the Treasury formally details its buyback plans in the quarterly refunding announcements that accompany its borrowing estimates, and the Fed publishes usage of the FIMA facility in its weekly balance-sheet reports.