这是一份nottingham诺丁汉大学ECON2018作业代写的成功案例

$$
\begin{aligned}
\Delta \text { Inventories } &=G D P-A E \
&=\$ 12,000 \text { billion }-\$ 10,400 \text { billion } \
&=\$ 1,600 \text { billion. }
\end{aligned}
$$
When GDP is equal to $\$ 4,000$ billion, aggregate expenditure is equal to $\$ 5,600$ billion, so that the change in inventories is
$$
\begin{aligned}
\Delta \text { Inventories } &=G D P-A E \
&=\$ 4,000 \text { billion }-\$ 5,600 \text { billion } \
&=-\$ 1,600 \text { billion. }
\end{aligned}
$$
Notice the negative sign in front of the $\$ 1,600$ billion; if output is $\$ 4,000$ billion, then inventory stocks will shrink by $\$ 1,600$ billion over the year.

ECON2018 COURSE NOTES ：

Here’s another way to see the logic behind Say’s law, with some simple equations. Because the loanable funds market clears, we know that the interest rate-the price in this market-will rise or fall until the quantity of funds supplied (savings, $S$ ) is equal to the quantity of funds demanded (planned investment plus the deficit, or $\left.I^{p}+(G-T)\right)$ :
Rearranging this equation by moving $T$ to the left side, we have:
Loanable funds market clears $\Longrightarrow \underbrace{S+T}{\text {Leakages }}=\underbrace{I^{p}+G}{\text {Injections }}$
So now, we know that as long as the loanable funds market clears, leakages equal injections. Finally, remember that
$$
\text { Leakages }=\text { Injections } \Longrightarrow \text { Total spending }=\text { Total output }
$$