102 Even today this is not, it is true, the only economic system in force everywhere; for there is another system also, which still embraces a huge mass of humanity, significant in numbers and importance, as for example, agriculture wherein the greater portion of mankind honorably and honestly procures its livelihood. This group, too, is being crushed with hardships and with difficulties, to which Our Predecessor devotes attention in several places in his Encyclical and which We Ourselves have touched upon more than once in Our present Letter.
Source: Quadragesimo Anno (Vatican.va)