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In finance speak, MSFT's cost of capital is dependent on the risk-free rate, usually the 10-year US treasury, which is incredibly low right now, thus moving MSFT's cost of capital (the 0.1 in your denominator) lower. A quick search tells me that their cost of capital is currently around 7%.
Also, you can't add assets in, since operating assets are required to generate that FCF. You can add in cash, though, which is pretty substantial for MSFT.
In any case lets use your 7% you end up with 400bill which is still 50billion less than what it is trading at.
Lending and borrowing rates are closely tied together since they're literally just two sides of the same market. Global long term rates have been slowly trending lower for the last few years.
Over a long period of time that is what the market has returned. It is not guaranteed.One year it might be down 50% one year it might be 50%, but if you look at 30years S&P has returned about 7.5%. 10% is a just a round number makes math easier. You can plug in a different number my point its hard to get to 450 billion.
S&P has returned ~6.5% over the long term in inflation adjusted returns. However, the trend has been lower returns over time and inflation is currently very low. https://dqydj.com/sp-500-return-calculator/ (You can look at the methodology, but they project further into the past.)
6.736% : 1871 to now
6.525% : 1900 to now
6.281% : 1930 to now
5.977% : 1960 to now
Further, there is a lot of volatility in these numbers consider: 7.446% : 1990 to now
2.352% : 2000 to now
PS Stable companies reasonably have a premium associated with that stability.Here are the numbers I got:
Annualized S&P 500 Return: 7.656%
Annualized S&P 500 Return (Dividends Reinvested): 10.047%
I didn't use CPI.
If you want to invest into MSFT at this price be my guest. I believe it is overvalued at this level with such limited growth.
PS: If yesterday the market shot up 30% that's not a good sign for the next month.
That's emotion, specifically, market greed.