The world’s great cities and the professionals who live in them are linked more tightly to one another than they are with their own rural hinterlands. Yet true prosperity starts in the countryside.

It’s not surprising that well-travelled professionals living in global cities, such as New Delhi, New York, Paris, Rio, and Shanghai, have more in common with one another, in lifestyle and values, than they do with rural citizens in their respective nations. In general, villagers, particularly in the emerging world, have benefitted less from globalization than urbanites have. Seventy percent of India’s citizens, for instance, live in rural isolation, largely disconnected from the benefits of their nation’s fast-paced economic growth.

These are globalization’s forgotten frontiers, where more must be done to connect urban markets with rural ones in order to speed their development. How this happens will vary from nation to nation. In China, for instance, the government actively spurred the village economy, largely through agricultural-reform measures implemented during the 1980s. By contrast, India’s government has only a limited ability to bring about real change in the country’s villages. Private entrepreneurs might well be more effective.

Recently, I trudged through the mire of a government-run food auction yard, or mandi, in Bangalore, the global economy’s offshoring capital. Piles of supposedly fresh produce lay everywhere, rotting in the sun and competing with mangy dogs and scampering mice for my attention. Huddles ...