Rural residents trained to provide primary care services to their communities.
As a way to overcome the urban bias in social service provision, a few decades ago China launched the Barefoot Doctor program. Rural residents received training in basic medical care to then go on to provide primary care services to their communities (deliveries, immunizations, infection control, etc.). Barefoot Doctors would often divide their time between serving as a care provider and continuing the work they did before becoming doctors (usually farming). Barefoot Doctors were an important node in the referral pathway connecting the more seriously ill patients to more sophisticated care in towns and cities. Although the program no longer exists, in its heyday Barefoot Doctors covered 90% of the country's rural cooperatives. As a state-run program, it's not exactly a social business. Nevertheless, this example demonstrates that the health and well-being of rural populations can be improved without having to rely on expensive infrastructure (hospitals), costly tools (medical equipment), or individuals with several years of specialized training (doctors).
image source: google image search (radically creative, I know)