Meeting minutes reveal concern about U.S. economy's vulnerabilities
Federal Reserve chair suggests tighter monetary policy won't reflect the 1980s
Unemployment rose to 3.7%, from 3.5% in July
Powell's message may disappoint investors who were hoping for a signal that the Fed might soon moderate its rate increases
The U.S. Federal Reserve's rate hikes aren't suited to address all the causes of high inflation, however
The potential increase depends on robust consumer demand
Some Fed watchers are complaining that the Federal Reserve chairman has failed to articulate a coherent and consistent policy
Concern grows that interest rate hikes could tip U.S. economy into recession
Meeting minutes suggest half-point increases may be appropriate ahead
The Fed chair appeared unconcerned Tuesday about the stock market's sharp decline over the past six weeks