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Stock prices are not only based on the performance of the company's income statement. Prices are based on demand for the security itself. Many investors will not invest in companies who's activity is contrary to their values and this effects demand for the stock.
If a company changes their activities in a way that many investors disagree with, then the demand for the stock could go down.
In this case, Cohn made a statement that I would hope most people around the world would oppose, and this could adversely effect the price of that equity.
