Pope John XXIII
Mater et Magistra §124
Mater et Magistra: On Christianity and Social Progress
124 We know that as an economy develops, the number of people engaged in agriculture decreases, while the percentage employed in industry and the various services rises. Nevertheless, We believe that very often this movement of population from farming to industry has other causes besides those dependent upon economic expansion. Among these there is the desire to escape from confining surroundings which offer little prospect of a more comfortable way of life. There is the lure of novelty and adventure which has taken such a hold on the present generation, the attractive prospect of easy money, of greater freedom and the enjoyment of all the amenities of town and city life. But a contributory cause of this movement away from the country is doubtless the fact that farming has become a depressed occupation. It is inadequate both in productive efficiency and in the standard of living it provides.
Source: Mater et Magistra (Vatican.va)