I hope that the question is asking you what happens to planned consumption. Because the answer to that would be that planned consumption **goes up** by $160 billion.

The reason for that is that Yd is the disposable income and .8 is the marginal propensity to consume. That means that every time people get an extra $100, they will spend $80 of it (and save the other $20). So to figure out what happens when people get $200 billion extra, you just multiply $200 billion by .8 and that's where you get your answer -- if they get $200 billion more, they will spend $160 billion of it.

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