Final answer:
An increase in nominal interest rates is likely to occur when there is a contractionary monetary policy accompanied by a decrease in the demand for money.
Step-by-step explanation:
An increase in nominal interest rates is likely to occur when there is a contractionary monetary policy accompanied by a decrease in the demand for money. In contractionary monetary policy, the central bank reduces the supply of money and credit in the economy, which leads to a higher interest rate. The decrease in the demand for money further contributes to the increase in nominal interest rates.