T. Models: Apply the supplyanddemand model to the following markets. In each case, state the ke},r endogenous variables in the market as well as some important exogenous variables or parameters. Also, express each model as a system of mathematical equations. As an example, Q = F[P, I?) might be the demand curve in the computer market, where f captures some exogenous variables like the availability of the iPod or computer games. How many equa tions are there within each example? How man].r unknowns? (a) The computer market. (b) The market for your favorite music. (c) The market for a particular currency, such as the dollar, the yen, or the euro. (Hint: This last example suggests an important point about \"exogenous