2PF-Pc: The unit cost of producing one yard of cloth and one calorie of food as a function of the price of one machine-hour, r, is r^4.
3Pc-2PF: The unit cost of producing one yard of cloth and one calorie of food as a function of the price of one work-hour, w, is w=4.
c. What happens to those factor prices when the price of cloth falls?
A decrease in the price of cloth will cause the rental rate of capital to fall and the wage rate of laborers to rise, leading to less production of cloth and a decrease in demand for the factor it uses intensively - capital.