Bank of America warns a new bubble may be forming in the stock market — and shares a cheap strategy for protection that is 'significantly' more profitable than during the last 10 years

· The attractiveness of US assets relative to the rest of the world is brewing a bubble in the stock market, according to equity-derivatives strategists at Bank of America. 
· They formulated a cheap strategy designed to profit from limited gains in some of the worst-performing stocks. 
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