There's $5T sitting on the sidelines. Imagine if half of that went into $AAPL $AMZN $GOOGL $MSFT&amp; $FB. Half a trillion to each of those 5 stocks. Thru the roof, right? That's what would happen if all $5T simply went into $SPY, bc those 5 stocks are half the S&amp;P 500. https://t.co/nYwGZwLTbm