Stark and Bainbridge with their religious economy approach argue that religions can be understood as organizations which are in competition with one another for followers. On the other hand, the classical theorists, Marx, Durkheim and Weber, assume that religion weakens when it is challenged by different religious or secular viewpoints whereas the religious economists argue that competition increases the overall level of religious involvement in modern society. Religious economists believe this to be true for two reasons. First, competition makes each religious group try that much harder to win followers. Second, the presence of numerous religions means that there is likely to be something for just about everyone. In culturally diverse societies, a single religion will probably appeal to only a limited range of followers while presence of Indian gurus and fundamentalist preachers, in addition to more traditional churches, is likely to encourage a high level of religious participation. Accordingly, religious economy model, that is, rational choice theory argues that the freer religious markets are, the more vital religion will be.