Forex concerns that the Federal Reserve is not doing enough to address inflation are boosting the case for investors to buy bonds linked to inflation, according to Barclays Plc and HSBC Holdings Plc.

Long-maturity US yields reached their highest levels in almost two decades last week, as Fed Chairman Kevin Warsh refused to say how policymakers would control inflation. Despite his assurances that the central bank is keeping a lid on price growth, investors are worried that the Fed may act too late to address inflation concerns.

The refusal of Fed Chairman Warsh to provide clarity on the Fed's inflation control measures has fueled worries among investors, leading them to seek protection from accelerating price growth. As a result, bonds linked to inflation, such as those with long-maturity US yields, are becoming increasingly attractive to investors.