A perfectly inelastic demand would imply what kind of demand curve?

According to the quantity theory, in the long run, an increase in the growth rate of ________ leads to an increase in the ________

A) real GDP; inflation rate B) the quantity of money; growth rate of real GDP C) the quantity of money; inflation rate D) real GDP; growth rate of velocity

Jeff owns a garage and has 3 mechanics to help him. With the tools used being fixed in the short run, his production function is given by 5 + 2L = Y , where L is the number of mechanics and Y is the number of cars they can fix. If Jeff hires a fourth mechanic, what will be the marginal product of the new mechanic hired?

a. 11 b. 13 c. 2 d. 7