Final answer:
The size of the M1 money supply is $1,900 billion.
Step-by-step explanation:
The M1 money supply includes currency, checkable deposits, and money held in money-market mutual funds by individuals. From the given information, the size of the M1 money supply can be calculated by adding the dollar values of checkable deposits, currency, and money-market mutual funds held by individuals:
- Checkable Deposits: $600 billion
- Currency: $500 billion
- Money-Market Mutual Funds Held by Individuals: $800 billion
Adding these values, the size of the M1 money supply is $600 billion + $500 billion + $800 billion = $1,900 billion.