Final answer:
When the Fed buys bonds in the open market during a recession, it increases the money supply and lowers interest rates, which can help to alleviate the recessionary gap.
Step-by-step explanation:
When the Fed buys bonds in the open market during a recession, it is conducting an expansionary monetary policy to stimulate the economy. This increases the money supply and lowers interest rates. The increased money supply leads to a higher demand for goods and services and can help to alleviate the recessionary gap.