Azim Shariff explains a study that found the greater the rate of belief in hell in developing countries, the stronger their economy:
[I]f supernatural punishment increases adherence to moral norms, and economic success rests on minimizing corruption and maximizing honest trade, then it makes sense that these types of religious beliefs could have a large scale impact. Indeed, we and others have argued that religious beliefs—and in particular those regarding omniscient, punitive supernatural agents that police our moral behavior—may have been instrumental in producing the level of cooperation required for early societies to grow beyond small groups where everybody knew each other.
The Dish 