I asked "a friend":
• Meta (META) ~3.1 %
• Alphabet (GOOGL + GOOG) ~3.8 %
• Tesla (TSLA) ~1.6 %
So just under 9%. Significant, I suppose, for just 3 of 500 stocks.
EDIT: since "etc." was mentioned, I thought I'd toss in some of the other top stocks in the S&P500:
• Apple Inc. (AAPL) ~6.7 %
• Microsoft Corp. (MSFT). ~6.6 %
• NVIDIA Corp. (NVDA) ~6.0 %
Amazon.com Inc. (AMZN) ~3.8 %
Another 20% or so. So the above seven stocks comprise about 30% of the S&P500 (Apple, Microsoft and NVIDIA are the "Big 3" at about 20% when combined).
The question is do you think you can get 35 years of this level of earnings out of a company. If yes or more then it makes sense. But a whole hell of a lot can happen in 35 years.
So, yeah it’s sort of like using that logic. Not exact as a dollar 35 years from now isn’t now, but you get the gist.
But I agree with the general problem of auditing advertising and performance. I've tried advertising on FB and my metrics never showed half of the engagement that they claimed.
I would assume VT and/or BNDW. Most sane index fund fans aren’t all in on s&p 500.
What they probably should start doing is paying a meaningful dividend to shareholders because they've repeatedly demonstrated they aren't capable of producing additional shareholder value with new product/business lines, but I don't see that as very likely in the near to medium term.
That's because it's more risky for the careers of the decision makers to hand cash back to shareholders and say they don't know what to do with it than it is to lay claim to some moonshot with a < 1% chance of success.