Although the population increase improves the labor force during the Industrial Revolution, Malthus criticizes the lower class for reproducing beyond their limits insisting upon preventive and positive checks in order to create a balance between population and food. During the Industrial Revolution the population increased because times were successful and people had work. However, the population was greater than the amount of food available per citizen so Malthus, a clergyman, proposed two solutions. First, he indicated that: "preventive check, is peculiar to men, and arises from that distincitve superiority in his reasoning faculties which enables to calculate distant consequences" (97). In other words, preventive check is based on reproducing depending on the amount of resources available. In second place, positive consists on: "every cause arising from vice and misery, which in any degree contributes to shorten the population" (99). In any case, both solutions imply a decrease of population of the lower class, since wealthy people can afford to have children and diseases usually attack the lower class, because he believes that the overpopulation is created by the lack of control of the lower class.