In a homogeneous product market, if a competitor raises prices it may not be matched by other firms if it does not benefit the industry as a whole, and the leading firm may need to rollback the increase. For non-homogeneous markets, factors to consider include why the competitor changed prices, if it's permanent or temporary, and the impact on market share and profits if no response is made, as well as likely responses from competitors and other firms. There are three possible responses to low-cost competitors: further product differentiation, introducing a low-cost venture, or reinventing as a low-cost player.