Because of unseasonably cold weather, the supply of oranges has substantially decreased. This statement indicates that a. consumers will be willing and able to buy more oranges at each possible price.
b. the demand for oranges will necessarily rise.
c. the equilibrium quantity of oranges will rise.
d. the quantity of oranges available for sale at various prices has declined.

Atennis club charges a monthly membership fee of $150 and charges it members $10 per hour to use a court. there's also $500 fee to become a member. stella joined the tennis club last spring, and she has been a member for 5 months. she has been playing 10 hours of tennis each month. stella values an hour of her time at $20. during a boring afternoon meeting, stella thinks about reserving a court to work on her serve for an hour tonight. what's stella's opportunity cost of working on her serve for an hour?