Suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. If the initial price of the used book is $82.50 and the discounted price is $62 , what is the percentage change in the book price

Which of the statements best describes why the aggregate demand curve is downward sloping? an increase in the aggregate price level causes consumer and investment spending to fall, because consumer purchasing power decreases and money demand increases. as the aggregate price level increases, consumer expectations about the future change. as the aggregate price level decreases, the stock of existing physical capital increases. as a good's price increases, holding all else constant, the good's quantity demanded decreases.