Individual investors who continually monitor the financial markets seeking mispriced securities: are overwhelmingly successful in earning abnormal profits. earn excess profits on all of their investments. make the markets increasingly more efficient. are always quite successful using only historical price information as their basis of evaluation. are never able to find a security that is temporarily mispriced.
The Efficient Market Hypothesis says that an investments price is based off all available information, so it is impossible to "beat the market" because something is priced just how it should be.
