Cleveland Fed's Hammack has expressed concerns about inflation. The longer it remains high, the more challenging it will be to reduce it. This statement suggests a correlation between the duration of high inflation and the difficulty of bringing it back down.

Further details about Hammack's statement are available from the source. The Cleveland Fed's perspective on inflation is provided through Seeking Alpha.

The source offers more information on this topic, providing insight into the potential implications of prolonged high inflation.