The logic is deceptively simple: Buffett piles up cash when the market is too expensive and about to crash. That's a poor look at the data.
"Why I Am Not Worrying About Warren Buffett's Record Stash of Cash"
drduru.com/onetwentytwo/2018/08/10/not-worrying-about-buffetts-record-stash-of-cash/
SPY 
BRK.A BRK.B
"Why I Am Not Worrying About Warren Buffett's Record Stash of Cash"
drduru.com/onetwentytwo/2018/08/10/not-worrying-about-buffetts-record-stash-of-cash/
SPY BRK.A BRK.B 
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The information and publications are not meant to be, and do not constitute, financial, investment, trading, or other types of advice or recommendations supplied or endorsed by TradingView. Read more in the Terms of Use.