The marginal theory of value takes account of both scarcity and desirability by holding that, the total value of a good depends on the rendered by the last unit consumed.
a. desirability
c. demand
b. utility
d. supply

The marginal theory of value takes account of both scarcity and desirability by holding that, the total value of a good depends on the utility rendered by the last unit consumed. When discussing the marginal theory of value, the theory does its best to explain how the discrepancy in value of goods has a marginal utility. Marginal utility is the additional value/satisfication that a consumer gains from buying one more unit of a good or service. Economist use this to help determine how much of something a consumer will buy and use.