Explain why the new IS curve that takes into account expectations is likely steeper than the original IS curve that ignored expectations
What will be an ideal response?
There are several factors that determine the size of the slope of the IS curve: the multiplier and the interest rate sensitivity of investment. The multiplier is now smaller because changes in current Y do not have as large an effect on current C. So, the mpc is smaller, the multiplier smaller, and the IS curve steeper. Also, a drop in the interest rate that is now temporary will not cause I to increase as much so the IS curve will be steeper. In the original IS-LM model, changes in Y and the interest rate were implicitly assumed permanent.
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