When the Federal Reserve tinkers with interest rates, that can affect the stock market. And, depending on the perception of whether it will help or hurt consumer confidence and the U.S. economy, that affects the overall performance of the stock market. The Fed will be deciding whether or not to raise interest rates on August [...]

The market is none too happy with the new Federal Reserve chairman for suggesting yesterday that he’d be raising interest rates several times before he was done.
Stocks fell today to close at the worst close since March. 
The Dow lost more than 110 points in midday trading before narrowing its loss later in the session. [...]