Final answer:
The maximum potential increase in the money supply is $330,000.
Step-by-step explanation:
To calculate the maximum potential increase in the money supply, we need to use the required reserve ratio. In this case, the required reserve ratio is 15%. The formula to calculate the maximum potential increase is: (Checkable Deposits) / (Required Reserve Ratio).
Using the given information, the checkable deposits start at $300,000. So, the maximum potential increase in the money supply is $300,000 / 0.15 = $2,000,000.
Therefore, the correct answer is (d) $330,000.