The isoquants for inputs that are perfect substitutes for one another consist of a series of:

A deficit-financed tax cut will ____ national savings and _____ private consumption

a. have no effect on; increase b. increase; decrease c. decrease; decrease d. decrease; increase

All these are motivations for tie-in-sales except,

a. Efficiency b. Assure quality c. Provide secret price discounts d. All the above