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Re:Five Biggest Stocks Are 23% of S&P 500 Market Cap by dgrin91 on Monday November 30, 2020 @09:54AM (#25254319)
To put the nail in the coffin, take a look at a comparison between the two: https://www.google.com/finance/quote/.INX:INDEXSP?sa=X&ved=2...

Historical performance of RSP has always lagged behind SPX

Re:Five Biggest Stocks Are 23% of S&P 500 Market Cap by beezle on Monday November 30, 2020 @10:05AM (#25254452)
That is not true at all. RSP has for many years outperformed SPX over many different time horizons. It really is not until 2019 that there is a significant underperformance which also coincides with the outsized top 10 market caps.

ref: https://stockcharts.com/freecharts/perf.php?RSP,SPY

change the window size to whatever time horizon you want.