Question: The price P in dollars to purchase a used car is a function of its original cost, C, in dollars, and its age, A, in years.
(a) What are the units of ∂P/∂A?
(b) What is the sign of ∂P/∂A and why?
(c) What are the units of ∂P/∂C?
(d) What is the sign of ∂P/∂C and why?