Investors have been in a good mood so far this week, but everything can change when the Federal Reserve is poised to make a pronouncement on monetary policy. The Fed will give its latest guidance on interest rates on Wednesday afternoon, and in advance of the central bank's release, markets didn't move much. The Dow Jones Industrial Average (DJINDICES: ^DJI) was down about 0.1% shortly after the beginning of the regular trading session Wednesday morning.