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The demand curve for money generally slopes down to the right on a normal supply and demand curve. However, the Transactions Demand of money is vertical.
Why is this the case?
People want more money when the price (interest rate) is high.
People want more money when the price (interest rate) is low.
People want the same amount of money to conduct transactions whether the interest rate is high or low.
The interest rate is irrelevant to the quantity demanded because transactional demand is about the need to facilitate transactions and not the rate of return.
Both C and D.