At home depot, a customer can purchase a gallon of one-coat paint that contains the ingredients for both a primer and a color. what is the primary economic need being satisfied by this type of paint?

Economy of purchase.

Explanation:

In the purchasing economy, customers are assured of the benefit of purchasing a product whose functionality is more efficient than similar products at corresponding prices. As stated in the question, whose gallon of paint paints using only one layer, which is an added benefit compared to a gallon of similarly priced paint that needs more than one layer to paint evenly.