The US dollar has weakened for the second consecutive month! Increased repurchase of US Treasury bonds has raised policy concerns, and Wall Street expects further declines in September.

The U.S. dollar weakened for the second consecutive month in August, as the Treasury Department plans to accelerate the repurchase of government bonds, raising new concerns among overseas investors about the direction of U.S. policy and reigniting speculation that the Trump administration's policies may lean towards a weaker dollar. Meanwhile, despite hawkish statements from Federal Reserve Chairman Waller that briefly strengthened the dollar, there remains a significant divide in the market over whether the Fed can fulfill the current interest rate hike expectations priced in. The Bloomberg Dollar Spot Index fell by 0.9% in August, marking a second consecutive monthly decline after a 1.3% drop in July. In the first eight months of this year, the index recorded declines in five months and is currently experiencing its longest streak of monthly declines since February. One significant reason the dollar has come under pressure this month is due to U.S. Treasury Secretary Yellen's more aggressive debt management policy. Earlier this month, Yellen unexpectedly announced that the Treasury plans to expand the scale of government bond repurchases, indicating that the size of individual Treasury buybacks could exceed $4 billion. This move has unsettled foreign investors and has reignited market speculation that a series of U.S. government policies may aim to weaken the dollar. In response, hedge funds, asset management companies, and other speculative investors have begun to reduce their long positions in the dollar. On Monday, Yellen further stated that she and Fed Chairman Waller are aligned on bond issues. This remark has reignited investor interest in the interaction between U.S. fiscal and monetary policy. Macro strategist Tatiana Darie noted that concerns about the credibility of the Feds monetary policy eased after Waller reaffirmed the Fed's inflation target last week; however, Yellen's latest comments remind investors of her more proactive intervention style in the market, which still introduces another layer of policy risk to the dollar. On Monday, the dollar dipped approximately 0.2%, partially retracing gains made last Friday. Last week, Waller committed to bringing U.S. inflation back down to the Fed's 2% target, prompting the market to increase bets on further rate hikes. U.S. inflation has now exceeded the Fed's 2% target for more than five consecutive years. Traders currently expect the probability of a Fed rate hike in September to surpass 50%, while the market has also raised bets on further tightening of monetary policy this year. Generally, an increase in rate hike expectations tends to boost the yield on dollar assets, which supports the dollar. However, some Wall Street institutions believe that current pricing in the market for Fed rate hikes may be overly aggressive. Wells Fargo strategist Erik Nelson expects the dollar to weaken further in September, as the Fed is unlikely to fulfill the rate hike magnitude already priced in by the market. Should this scenario prove accurate, as traders retract their previous rate hike bets, both Treasury yields and the dollar may face repricing pressures. Currently, dollar movements are influenced by two opposing policy forces. On one hand, Waller has explicitly reaffirmed the 2% inflation target and signaled further tightening of monetary policy if necessary, thus bolstering confidence in the credibility of Fed policy and providing some support for the dollar. On the other hand, Yellens expansion of Treasury buybacks and more active intervention in the bond market have raised investor fears that the U.S. government may seek to lower long-term financing costs and reignited speculation regarding a weaker dollar policy. Therefore, even as Fed rate hike expectations heat up, the dollar has not gained sustained upward momentum. This policy divergence has also made the foreign exchange market more sensitive to U.S. economic data. Particularly, Waller is not inclined to use forward guidance to signal future interest rate paths to the market, meaning investors need to rely more heavily on each economic data point to gauge the Feds next moves. The market will focus this week on the latest U.S. employment report set to be released on Friday, to further assess the state of the U.S. economy and labor market. Bank of America foreign exchange strategist Alex Cohen stated that August U.S. economic data will be crucial. If employment and inflation data prove weak, the Fed may continue to keep rates unchanged; however, if the data again surpass expectations, further rate hikes may become a more urgent option, thus testing the Fed's policy credibility once more. As the market awaits new economic data, the volatility of the dollar has begun to rise. Over the past two trading days, the one-month implied volatility of the dollar index has increased, indicating that traders are preparing for potentially greater exchange rate fluctuations in the coming weeks. Overall, the dollar finds itself in an environment where fiscal policy and monetary policy signals are pulling in different directions. Yellen's expansion of Treasury buybacks has rekindled concerns that the U.S. government may prefer a weaker dollar, while Waller's hawkish stance has reinforced rate hike expectations and provided support for the dollar. With the dollar declining for the second consecutive month, the forthcoming U.S. employment and inflation data will be crucial in determining the dollar's trajectory in September.