Mater et Magistra §187

¹⁸⁷ As it affects the less developed countries, the problem is stated thus: The resources of modern hygiene and medicine will very shortly bring about a notable decrease in the mortality rate, especially among infants, while the birth rate—which in such countries is unusually high—will tend to remain more or less constant, at least for a considerable period. The excess of births over deaths will therefore show a steep rise, whereas there will be no corresponding increase in the productive efficiency of the economy. Accordingly, the standard of living in these poorer countries cannot possibly improve. It must surely worsen, even to the point of extreme hardship. Hence there are those who hold the opinion that, in order to prevent a serious crisis from developing, the conception and birth of children should be secretly avoided, or, in any event, curbed in some way.