Hello! Professor Lin, can you explain this sentence----"actual investment spending will be greater than planned investment spending when there is an unplanned increase in inventories." Can you give me an example? The meaning of "investment" is inventory change?

Professor, In this chapter disposable Income =personal income -taxes +transfer payment
and pesonal income=national income -taxes + transfer payment.
so, disposable income=personal income?

Professor, I think the answer C is inappropriate. first, the global- trade commodities priced in terms of US dollar not Oaklandian dollar. second, even if the value of Oaklandian dollar increases, it will increase the import and decrease the export. so the net exports will decrease. Because it increase the import, that is to say, the aggregate demand in Oakland will increase. But what is the question is to find an answer to weaken his claim.....

AE=C+PI+G+NX and Gdp=C+I+G+NX what are the differences？how about planned investment and actual investment？

Why is Current Disposable Income the most important determinant of consumption?

under the premise that the net taxes are constant, MPC=delta C/delta Y= delta C / delta YD and MPS = delta S / delta Y = delta S / delta YD. Is that right?

Why is E not right? Having excess capacity also means overproduction.

Hello Lin! Why a decrease in price level will increase consumption? I think if the price falls, consumers will reduce consumption. Because their confidences of consumption will fall and they will wait for prices to go lower!

In most time, when we discuss aggregate expenditure model, we use the buyers' side? (Table in 802 and Graph in 819)

dear lin, i want to ask you why this question don't equals to 800. the mpc=0.75 so the mps=0.25 we said the investment equals to the saving. the investment =200, so the saving =200 we use 200/mps =800. why 800 is incorrect?

P810: "Investment is subject to larger changes than is consumption." Near this sentence, I took notes that households have to eat and survive, but the company can shut down. I can understand my notes, but what does this sentence mean exactly?

why the potential GDP is vertical in the 45-line diagram?