Can someone ELI5 how the S&P500 can keep an average 10% growth rate for another 30+ years? The total market capitalization of the S&P500 is $52 trillion, if my math is right this means it would double to over $100trillion in 7ish years, and by the end of 30 years be approaching almost $1quadrillion in value ($900 trillion)?  That sounds really stupid and impossible to me. Plus with the birth rate is in constant decline, market growth is only going to slow as less consumers ente