Stocks could tumble 20-30% on a 2nd-wave virus spike and China tensions, warns one long-standing market bull

· *Longtime market bull Ed Yardeni sees escalating US-China tensions and rising coronavirus cases placing significant pressure on the stock market's steady rise.*
· *Equity prices could slide 20% to 30% if the growing risks catch up with investors' hopes for a smooth economic recovery, Yardeni said on CNBC.*
· *The...