Zero profit in the economic sense means that firms are earning a normal rate of return.

Two variables are unrelated if their graph is i. a vertical line. ii. a 45 degree line. iii. a horizontal line

A) i only B) ii only C) iii only D) i and iii E) i, ii, and iii

The demand for an input used in a fixed proportions technology

A) is identical to the demand for the other inputs. B) is greater than the demand for the end product itself. C) lies below the demand for the end product itself. D) is the same as the demand for the end product itself.