Stock investors are the most bullish they've been in 15 years, one measure shows

· *One stock market indicator shows investors haven't been this bullish in at least 15 years, according to Goldman Sachs.*
· *Short interest in the S&P 500 has fallen to its lowest level since at least 2005, as the stock market hits record highs despite underlying weakness in the economy due to COVID-19.*
· *While short...