Intergenerational Cooperation

The accumulation and transmission of knowledge is a type of inter-generational cooperation. For the benefit of the next generation, each generation spends time and effort to pass down its knowledge to the next generation, and the whole society better off.

Taking care the old is another type of inter-generational cooperation.  For the benefit of the next generation, each generation spends time and effort to takes care of the old, and the whole society better off.