Index weighting in S&amp;P500? More like S&amp;P5...
Chart by 
@michaelbatnick
 
Let me put it like this: if 247 index companies (50% index!) lost HALF their market cap, this would have -10% change on index, without weighting change effects.

#Investing #SPX500 #StockMarket #Data https://t.co/bQ7n1S5hwr