A constant returns to scale production function can be described as xY = Af(xL, xK, xH, xN), where Y is the quantity of output, A is the level of available production technology, L is the quantity of labour, H is the quantity of human capital, and N is the quantity of natural resources. If we let x = 1/L, then the equation becomes Y/L = Af(1, K/L, H/L, N/L) which provides

Select one:

a. a measure of the availability of natural resources

b. a measure of gross domestic product

c. a foundation for measuring inflation

d. a summary of the four determinants of productivity