<span>The idea of the foot-in-the-door technique stipulates that if Shondra
thinks Alicia may refuse to lend her the shoes, she is more likely to get them if
she first asks to borrow something else that Alicia will refuse to give her,
and then ask to borrow the shoes.</span>
Answer:
$50 billion
Explanation:
The net effect on aggregate demand of the additional investment spending will be derived by multiplying the increased spending by the Multiplier.

Where MPC is the marginal propensity to consumer, and
MPS, the marginal propensity to save.
Therefore the multiplier =
= 2.5
Accordingly, the increase in aggregate demand as a result of the increase in the investment
= 2.5 * $20 billion
= $50 billion
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