It can. When conditions are harsher and cost of living increases, people tend to have less kids. Notice how overpopulation is a problem in shitholes like Africa, India, Bangladesh, etc. Places where IQ is low as fuck. Europe is dealing with another problem (ageing of its population) but that's a different case

Look at Japan. They are stabilizing the number of population, unlike Europe which is committing suicide importing 3rd world population 

India is a shithole, and Indians are subhumans. You know you wouldn't like living in that nation