00:01
So here we need to do some macroeconomic accounting, and we're given some information about this economy, right? consumption is 200 plus two -thirds, y minus t.
00:11
So consumers spent two -thirds of their disposable income.
00:14
Planned investment is 300.
00:17
Government spending is equal to taxes is also equal to 300, right? so if y is equal to 1 ,500, how much is planned spending? well, so if y is equal to 1500, that would mean that consumption would be 200 plus two -thirds outside of 1500 minus 300, right? that consumers would plan to spend based on their disposable on the national income of 1 ,500.
00:48
So here you would have 200 plus 2 over 3 times 1 ,200.
00:55
That would be 1 ,000.
00:58
So now to check if equilibrium, we want to see if the national income identity holds.
01:07
Is it equilibrium? well, we need to see if y is equal to c plus i plus g.
01:11
That is if planned production actually equals planned expenditure.
01:15
If expenditure does not equal production, we have a problem, right? because people can't consume things that were not produced, and people can't sell stuff that nobody wants to buy.
01:24
So 1500 is equal to 1 ,000 plus 300 plus 300.
01:33
And you see we have a problem, right? these things don't add up...