What are the two basic types of economic systems?

A demand curve is a

A) graphical representation of the demand schedule. B) graphical representation of alternative demands. C) horizontal line connecting amounts demanded at various income levels. D) graphical relationship, that includes several things such as tastes, time, and supply.

Bob is planning to sell his home. In preparation for the sale, he paints all of the ceilings in his house to cover up water stains from his leaking roof so that potential buyers will be unaware of this problem. This is an example of

a. moral hazard. b. screening. c. adverse selection. d. the principal-agent problem.