Which of the following combinations of macroeconomic changes is most likely to cause a decrease in the size of an economy's national income multiplier?
A rise in the household saving ratio and a reduction in import tariffs that increases the marginal propensity to import (MPMMPMMPM)
A decrease in the basic rate of income tax and a fall in the household saving ratio
An increase in the marginal propensity to consume domestic goods (MPCdMPCdMPCd) alongside a reduction in corporate tax rates
A rise in business confidence that stimulates investment via the accelerator effect, alongside a decrease in the marginal propensity to import (MPMMPMMPM)
