I disagree. FV of the current spot price using the risk-free rate is at best the opportunity cost for that money. Nobody says that is the central expectation of the spot price.
Imagine the stock in a company growing its earnings and sales in a fairly steady manner for 10-12% each year. Current stock price is $127 with a reasonable P/B ratio. It is headed by an octogenarian who has proven himself over and over, all the while media pundits say he is losing his touch. Lately because he bought a chunk of a tech company with falling sales and threat from a cloud.
What is the expected price of this stock 1 year from now, if the risk-free rate (assuming inflation of 1% and 10Y treasuries at 2.5%) is about 1.5%? Somehow, $128.905 seems inadequate.
When I put it like that, maybe I should buy more But I am already at 20% of my portfolio in this one stock. There is specific risk to cconsider.
^ Thinking more about this - if the strong EMH held, you may be right.
If all knowledge, private and public, is correctly reflected in the current spot price, and since future is unknowable, we treat any future developments as random, with an expected (average) impact of 0 on the price, then the best we can say is that the security will be worth today’s price * (1 + RFR.) If it wasn’t, then the security is mispriced and the efficient market will arbitrage that mispricing away in a nanosecond with no frictional costs to do so.