In the global foreign exchange landscape, the euro stands as the most critical vehicle for any dollar depreciation trade thesis. With the largest weighting within the dollar index, euro-dollar movements effectively mirror broader market sentiment toward the greenback.
On Wednesday, August 19, the U.S. Treasury unveiled an expanded long-dated debt buyback program, triggering notable dollar selling and reopening the transmission channel between bond markets and currency markets. While the actual scale of intervention remains modest, the signaling effect carries far greater significance. Combined with America's towering debt burden, medium-term risks for the dollar have surfaced, placing euro-dollar at a pivotal technical crossroads.
Treasury Buyback Policy Takes Effect, Signal Value Outweighs Actual Size
The U.S. Treasury announced it would raise single-operation buyback amounts for 10-to-30-year bonds to at least $4 billion, effectively doubling the scale, with operations slated to continue into early November. The policy statement also left the door open for further extensions and expansions. When measured against the sheer magnitude of U.S. public debt, the incremental buyback volume is relatively limited, with minimal impact on the overall debt pool.
Market analysts emphasize that the signal conveyed by the policy matters more than the dollar amount involved. This move represents official, proactive intervention to support the long-end of the bond market, artificially capping upward pressure on yields.
In a High-Debt Environment, Bond Market Pressures Cascade into Currency Markets
U.S. public debt has now surpassed $40 trillion, with publicly held debt approaching 100% of GDP. Primary fiscal deficits remain elevated, interest expenses continue climbing, and the supply of bonds that private markets must absorb keeps expanding. Left entirely to market forces, bonds would require higher yields to attract capital and digest supply.
However, when the Treasury persistently props up long-dated bond prices and constrains yield upside, the government's funding needs do not disappear—only the yield adjustment channel is severed, shifting that market pressure onto the currency. U.S. Treasuries still retain a yield advantage over German bunds, but the 10-year spread has narrowed to 139 basis points. Should that advantage continue shrinking, combined with intensified Treasury intervention, bond market stress would quickly transmit to the dollar.
We have not yet entered a full-fledged dollar depreciation phase, but if interventions keep escalating to offset the consequences of unsustainable fiscal policy, the dollar would become the market's pressure-release valve. Given the eurozone capital market's substantial depth, euro-dollar would likely react first.
Market Reaction Does Not Equal Long-Term Trend, Technical Battle Intensifies
The market response to this policy represents short-term stimulus and does not directly rewrite the medium-to-long-term trajectory. Long-dated yields have pulled back, but a single intervention is unlikely to reverse the broader cycle. Thursday's early-session dollar decline carries the risk of short-term giveback, with technical indicators serving to define the boundaries of the move.
Driven by the policy, euro-dollar has delivered a standout performance, reclaiming its 200-day moving average for the first time since May. The pair surged above 1.1687 before encountering resistance—a level that has alternated between support and resistance multiple times this year and now stands as the most critical near-term observation point. Oscillators lean bullish overall, with the 14-day relative strength index climbing to 73, entering overbought territory and signaling short-term correction risk, while MACD remains positive, further supporting the bullish case.
Upside resistance levels to watch include 1.1723 and 1.1785. Should prices retreat and sustainably break below 1.1670, a reversal scenario could unfold, with downside targets pointing toward the 200-day moving average and the 1.1614 retracement level.
Summary
In aggregate, the U.S. Treasury's expanded long-dated bond buybacks have weakened the dollar and boosted the euro in the short term, but the intervention's limited scale leaves the sustainability of the move open to question. The deeper contradiction stems from America's ballooning debt—when the yield adjustment mechanism is artificially constrained, the exchange rate must absorb more of the adjustment burden.
As the core observation vehicle, euro-dollar requires tracking both fiscal and bond market policy shifts while respecting key technical levels, to determine whether the dollar depreciation narrative can truly take hold.
Euro-dollar daily chart. As of 15:22 Beijing time on August 20, euro-dollar was trading at 1.1680/81.
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