Answer:
$500
Step-by-step explanation:
Money demand can be described as the part of an assets in which an individual is ready to hold as cash, this cash can be used to purchase goods and services.
In the scenario described above, Joan's money demand is
= Cash balance+Checking account balance
Cash balance = $200
Checking account balance = $300
Money demand= $200+$300
= $500
Hence Joan's money demand is $500