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23 Provide the behavioural assumption behind why the investment function depends on the real interest rate. Provide the behavioural assumptions behind why the consumption function depends on disposable income but is insensitive to the real interest rate, ut of (You need to show your explanations and works in order to earn points in this question.) (For this question, you have to hand-write your answers. You then take a photo or scan your hand-written answers and upload your files. (Files with typedup answers and computergenerated graphs will NOT be accepted.) On each page of your handwritten answers, write down your name, your student # and sign it. You could at most upload 3 files. Max file size 100MB. Acceptable file types are PDF and image files including JPEG, GIF, PNG, BMP, TIFF.)