find out quantity demand by each consumer at a given market price.
Karen earns $75,000 in the current period and will earn $75,000 in the future.
a) Suppose that these are the only two periods, also that banks in her country borrow and lend at an interest rate r = 0, draw her inter-temporal budget constraint.
b) Now suppose banks offer 10 percent interest on funds deposited during the current period, and offer loans at this same rate. Draw her new inter-temporal budget constraint.