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"Bull" is an investor who thinks that the market, certain stock or industry will rise. Bulls are optimistic and presently predicting good things for the market, and are attempting to profit from this upward movement
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unlike "Bears" who are pessimistic and believe that a particular security, commodity or entity will suffer a decline in price.
It's rather interesting seeing the back and forth of the Bull vs. Bear Market, I consider myself a bull of course, until further notice....