"To determine if a structural intervention of providing one condom a week to inmates in the Los Angeles County Men’s Central Jail MSM [men who sex with men] unit reduces HIV transmissions and net social cost, we estimated numbers of new HIV infections (1) when condoms are available; and (2) when they are not ... The discounted future medical costs averted due to fewer HIV transmissions exceed program costs, so condom distribution in jail reduces total costs." (p. 2695).