To assess a industry group's potential, an investor would want to consider the overall growth rate, market size, and importance to the economy. While the individual company is still important, its industry group is likely to exert just as much, or more, influence on the stock price. When stocks move, they usually move as groups; there are very few lone guns out there. Many times it is more important to be in the right industry than in the right stock! The chart below shows that relative performance of 5 sectors over a 7-month time frame. As the chart illustrates, being in the right sector can make all the difference.