If an individual is to hold lower money balances on average, she must make more frequent trips to the bank to withdraw money. This inconvenience of reducing money holding is called:

The risk that increased market interest rates will cause a decline in the value of an investment bank's holdings of long-term securities is known as

A) credit risk. B) interest-rate risk. C) currency risk. D) security risk.

What is the marginal cost of producing the third unit?

a. $100 b. $200 c. $300 d. $400