Replying because I forgot two rather important point: * child mortality is lower nowadays, therefore there is usually a temporary population boom in industrial

Replying because I forgot two rather important point: * child mortality is lower nowadays, therefore there is usually a temporary population boom in industrializing societies. This is because * in preindustrialized societies, people are aware that their children are their primary means of economic support in old age. Pension schemes have eliminated this incentive in industrialized countries, but a collapse of such schemes will force people to reconsider this point. People might consider to re-prioritize children over other life goals.