Abby Joseph Cohen is an American economist and financial analyst on Wall Street. She is a partner and—as of March 2008—Senior U.S. investment strategist at Goldman Sachs responsible for leadership of the firm's Global Markets Institute. Prior to that date, she was Chief Investment Strategist. In 2001 she was named one of the 30 most powerful women in America by Ladies Home Journal.
Models work when they are appropriate for the particular circumstance, but some of the best investment judgments over time have come when people recognized that models derived in other periods were broken or not directly relevant.