Answer: the expectation of future real earnings growth.

An increase in P/E multiple typically reflects increased investor optimism about future earnings growth prospects. When investors expect higher future real earnings growth, they are willing to pay more for each dollar of current earnings, driving up the P/E ratio. Options A and B would typically decrease P/E multiples - higher equity risk premium and inflation uncertainty increase the required rate of return, which would lower P/E ratios.

Author: LeetQuiz Editorial Team