In an economy with households and business firms, but no government and no international trade, aggregate expenditure is:

$•$ business investment expenditure on buildings, machinery and equipment and inventories.

O household expenditure on food, clothing and entertainment.

$•$ household consumption expenditure plus business investment expenditure.

$•$ business investment expenditure plus household saving.

e$)$ If the consumption function for a closed economy with no government is C $=250+0\mathrm{.}75$Y:

$•$ the multiplier is $1/0\mathrm{.}75$

$•$ the marginal propensity to save is $1/0\mathrm{.}75$

$•$ the multiplier is $4.$

$•$ the marginal propensity to consume is $0\mathrm{.}25.$