In an economy, when disposable income increases from $400 to $500, consumption expenditure increases from $450 billion to $525. What is the marginal propensity to consume, the change in saving, and the marginal propensity to save? The marginal propensity to consume is >Answer to 2 decimal places. When disposable income increases from $400 billion to $500 billion, saving increases by billion. The marginal propensity to save is Answer to 2 decimal places