The value of marginal product of an input is the value of the
a. total output produced by total inputs.
b. average output produced by inputs.
c. output produced by the last unit of an input.
d. output produced by the first unit of an input.
A diminishing marginal rate of technical substitution along and an iso quant curve indicates that the iso quant is
a. concave to the origin.
b. convex to the origin.
d. nonlinear and concave to origin.