Suppose that velocity rises while the money supply stays the same. it follows that
a. p x y must rise.
b. p x y must fall.
c. p x y must be unchanged.
d. the effects on p x y are uncertain.

The correct answer is A

Explanation:

Velocity is the rate at which the people or individual spend money or cash. The velocity is the yield in the money supply. And when the velocity rises , means that the spending is increasing, keeping the money supply same, it states or follows that the:

P × Y must increase or rise

where

P is Price

Y is Quantity

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