Global poverty is one of the world's most vexing problems. For decades, we've assumed smart, well-intentioned people will eventually be able to change the economic trajectory of poor countries. From education to healthcare, infrastructure to eradicating corruption, too many solutions rely on trial and error. Essentially, the plan is often to identify areas that need help, flood them with resources, and hope to see change over time.

But hope is not an effective strategy.

Clayton M. Christensen and his co-authors reveal a paradox at the heart of our approach to solving poverty. While noble, our current solutions are not producing consistent results, and in some cases, have exacerbated the problem. At least twenty countries that have received billions of dollars' worth of aid are poorer now.