Earlier quoted context omitted.
The iShares S&P 500 ETF has returned about 11.6% annualized over the past ten years. Their Ex-US ETF: 2.8%. Point being: the third variable no one ever takes into account when considering Buffett's advice: "just invest in broad market indexes" literally only works in the US, and only has worked historically . It's not a coincidence that the US is the youngest developed economy on the planet. In other words: How high…
The US is at least as old as the concept of a contemporary “developed economy”, so it doesn’t seem like this part of the argument holds.
Everyone invests in US stocks/ETFs/companies if they want to see good returns.