From a resource standpoint, the important point of this comparison is that including the marginal external costs of production and allocating resources based on the full social cost results in a higher price for the good (Ps > Pp) and less output (Os < Op) than only including the private costs.
Today, the nation's farmers are 17 years older than the average American worker, with the ranks of farmers who are 75 years and up outnumbering those in their prime working years of 35 to 44. One big reason U.S. farmers are going gray: spiraling costs.
Breeding animals will remain on the farm an average of 1.5 years longer than market pigs. If you rescue a pig originally intended as a food animal, it has the potential to live to its full lifespan of 20 years. It will additionally likely double or triple in size over the next several years.