(Q1) Besides the SRAS-shift, it can be shown that the AD-curve would shift as well, but in the opposite direction. (a) Applying the law of diminishing marginal productivity of capital (MPK), explain why the destruction of capital stock would stimulate investment demand (i.e., right/up-ward shift in the I-curve). (b) Since investment demand is a component of the demand for loanable funds (recall that Ld = I + NX), the right/up-ward shift in the I-curve would shift the Lª curve in the same direction, thus driving up the interest rate in the loanable-funds market to a level above the real interest in the money market (i.e., credit > -money = Rmoney-g). Explain how to close this interest-rate gap (Ar) via either ONE of the following two alternative adjustments, and then conclude why the AD-curve would shift right/up-ward. i. An adjustment in the price level (P) at any given Yd-level; ii. An adjustment in the level of output demanded (Y) at any given P-level.

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2.2 Capital destruction
Suppose some capital stock in an economy was destroyed by terrorist bombing, leading to
a decrease in the supply of capital inputs. Due to factor complementarity, the marginal
productivity of labor (MPN), hence the demand for labor inputs (Nd), would fall. As a
result of the reduction in the employment of both capital and labor inputs, production of
output would drop at any given price level implying a leftward shift in both the LRAS and
SRAS curves.
(Q1) Besides the SRAS-shift, it can be shown that the AD-curve would shift as well, but
in the opposite direction.
(a) Applying the law of diminishing marginal productivity of capital (MPK), explain
why the destruction of capital stock would stimulate investment demand (i.e.,
right/up-ward shift in the I-curve).
(b) Since investment demand is a component of the demand for loanable funds (recall
that Lª = I + NX), the right/up-ward shift in the I-curve would shift the Lª
curve in the same direction, thus driving up the interest rate in the loanable-funds
market to a level above the real interest in the money market (i.e., credit >
7-money = Rmoney-ge). Explain how to close this interest-rate gap (Ar) via either
ONE of the following two alternative adjustments, and then conclude why the
AD-curve would shift right/up-ward.
i. An adjustment in the price level (P) at any given Yd-level;
ii. An adjustment in the level of output demanded (Yd) at any given P-level.
(Q2) Combining the SRAS-shift with the AD-shift (and assuming that the former dominates
the latter), explain how the equilibrium price level (P) and output (Y) would change
in the short run.
Transcribed Image Text:2.2 Capital destruction Suppose some capital stock in an economy was destroyed by terrorist bombing, leading to a decrease in the supply of capital inputs. Due to factor complementarity, the marginal productivity of labor (MPN), hence the demand for labor inputs (Nd), would fall. As a result of the reduction in the employment of both capital and labor inputs, production of output would drop at any given price level implying a leftward shift in both the LRAS and SRAS curves. (Q1) Besides the SRAS-shift, it can be shown that the AD-curve would shift as well, but in the opposite direction. (a) Applying the law of diminishing marginal productivity of capital (MPK), explain why the destruction of capital stock would stimulate investment demand (i.e., right/up-ward shift in the I-curve). (b) Since investment demand is a component of the demand for loanable funds (recall that Lª = I + NX), the right/up-ward shift in the I-curve would shift the Lª curve in the same direction, thus driving up the interest rate in the loanable-funds market to a level above the real interest in the money market (i.e., credit > 7-money = Rmoney-ge). Explain how to close this interest-rate gap (Ar) via either ONE of the following two alternative adjustments, and then conclude why the AD-curve would shift right/up-ward. i. An adjustment in the price level (P) at any given Yd-level; ii. An adjustment in the level of output demanded (Yd) at any given P-level. (Q2) Combining the SRAS-shift with the AD-shift (and assuming that the former dominates the latter), explain how the equilibrium price level (P) and output (Y) would change in the short run.
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