Keynes a) Explain the argument that Keynes made as to why it was firms desired Investment that determined Savings rather than vice versa. How does this relate to the idea of Effective Demand and its impact on output (income)? In which work did Keynes first present this idea? b) What political positions did Keynes take in his Economic Consequences of Peace? c) Explain the concept of the multiplier. If "marginal propensity to consume" is ½ and government increases spending by 100$, how much will output go up, according to the Keynesian Cross? d) What are the three markets in the IS/LM model?