Final answer:
The monetary base will remain unchanged with the increase in currency in circulation being exactly offset by a decrease in bank reserves.
Step-by-step explanation:
The withdrawal of $500 in cash from an ATM machine will affect the monetary base in the following way:
- The monetary base will remain unchanged with the increase in currency in circulation being exactly offset by a decrease in bank reserves.
When Trevor withdraws $500 in cash, the currency in circulation increases by $500. However, since the withdrawal reduces the bank's reserves by an equal amount, the overall monetary base remains the same.