The rate of growth of the population is higher than that of the output of the production of food, energy, or water. This means that these resources will end up costing more do their gradual growth in scarcity. This, added to the phenomenon of inequality in the distribution of wealth, will directly affect the quality of life of the lower income populations.
Communism has a centrally planned economy; it can quickly mobilize economic resources on a large scale, execute massive projects, and create industrial power.