The economist Irving Fisher explained the impact of a person's income size on his demand for interest. He showed that lower-income or poverty O a. increases impatience for present income enjoyment and lowers the rate of interest demanded. O b. reduces impatience for present income enjoyment and lowers the rate of interest demanded. Oc reduces impatience for present income enjoyment and raises the rate of interest demanded O d. increases impatience for present income enjoyment and raises the rate of interest demanded