The question that I want is 9 a and b

Agood for which demand increases as income rises is and a good for which demand increases as income falls is

Based on the supply and demand theory, why do medical doctors earn higher wages than child-care workers?

Which statement best explains the relationship between points a and b? a. consumption reaches its highest point, and then supply begins to fall. b. inflation reaches its highest point, and then the economy begins to expand. c. production reaches its highest point, and then the economy begins to contract. d. unemployment reaches its highest point, and then inflation begins to decrease.