Need some help with these homework questions, thanks!

Question 19 The spending multiplier indicates that: O the marginal propensity to consume is greater than one. Q a market economy will be more stable than classical economists thought. 0 an autonomous increase in saving will cause output to rise by a multiple of the additional saving. 0 changes in investment, government, or consumption spending trigger much larger changes in real GDP. Question 20 The national debt is best described as the: 0 amount by which this year's federal spending exceeds its taxes. 0 percentage of GDP needed to nance a country's investment. 0 sum of all federal budget decits and surpluses, past and present. 0 value of all U. 5. Treasury bonds owned by foreigners