00:01
Assume that a hypothetical economy with marginal propensity to consume of 0 .8 is experiencing extreme recession.
00:12
Okay.
00:13
So what does it mean when mpc is equal to 0 .8? that means that for every $1 of increase in pay, a consumer will spend 80 % of it.
00:33
So 80 % goes to spending in this economy.
00:38
Economy.
00:40
Okay, so back to the problem.
00:42
But how much will government spending have to rise to shift the aggregate demand curve rightward by $25 billion? okay, so we remember the formula for aggregate demand.
00:56
It's consumer consumption plus investment spending plus government spending plus net exports.
01:05
So the answer to part a is $25 billion.
01:08
An increasing government spending of $25 billion will increase the real economy, $25 billion.
01:16
Question b, how large a tax cut would be needed to achieve the same increase in aggregate demand? ron, your answer to two decimal places and entry your answer is a positive number.
01:27
Okay, so the tax cut is going to need to be bigger than $25 billion, since consumers will save 20 % of every dollar they earn.
01:37
So we're going to do $25 billion divided by $0 .8.
01:41
And that gives us $31 .25 billion.
01:53
Now, why did i divide? basically because the marginal propensity consumed was 0 .8.
02:02
The formula we use is aggregate demand shift divided by marginal propensity to consume is tax cut needed.
02:15
Okay, so that's part b.
02:18
Now, part c, determine one possible combination of government spending increases and tax increases that would accomplish the same goal without changing the amount of debt.
02:33
So we need to increase government spending by some amount and increase taxes by some amount.
02:38
Okay.
02:40
So we're going to increase government spending.
02:44
We already know by $25 billion.
02:59
And this time we're going to increase taxes by $32.
03:05
Now what that does, so what's going to happen? so gdp is going to go up by 25 billion and okay, so we don't want to change debt.
03:52
So just to show you real quick, let me back up just a bit...