https://www.macrotrends.net/stocks/charts/KO/cocacola/pe-rat...
There are two ways that a P/E can return to a quasi-normal value. Either the price can go down or the earnings can increase.
The mean and median values, since 1880, are about 15.
"This time, it's different" https://www.multpl.com/s-p-500-pe-ratio
However, I'm not pulling out because realistically, there's no other asset that's safer in the long run. Interest rates are close to zero so returns in bonds are low, inflation will eat away money held in cash deposits and don't even get me started on cryptocurrency, rare sneakers or other "alternative investments". I started investing in stocks in 2017, even then people were warning that we were in a bubble that was bound to burst at some point. Not investing would have missed me several years of above-average returns.
But today, there seems to be a bubble on everything after all the money printing. So I'll keep investing in good, underhyped and stable companies and try to weather whatever storm, good or bad, will come in the next years.
This is the obvious strategy, reduce your risk tolerance and go with proven companies. Put your money (fresh from your bank account, not from your portfolio) into moonshots when you can afford to lose them, after that put the moonshot money back into your boring but relatively safe investments. There are low volatility or stable dividends ETFs that specialize in this.
KO has excellent margins - last time I looked they were around 60%. That means prices * sales only has to increase by 5x to bump earnings up 3x. Food prices have been inflating at 10-15% recently; 15% inflation over 11 years will get you there, and that doesn't include any growth in sales at all. These aren't unreasonable assumptions, given the macro environment: another 1970s inflationary episode would do it. (Indeed, Warren Buffett made a lot of his money investing in Coca-Cola and See's Candies during the 1970s.)
I am not sure about the logic (are you assuming marging expansion?) but probably you are trying to say something else than revenue has to increse "only" five-fold for earnings to triple.
> Food prices have been inflating at 10-15% recently;
Sure.
This thoughtful Quora post claims that Buffett made his first purchase of KO at a P/E of 29.
https://www.quora.com/What-was-the-P-E-Buffett-paid-for-Coca...