Is this the most effective development programme in history?” asks Chris Blattman, a political scientist at Columbia University. He adds, “I think it’s a contender.”

The programme is simple enough to explain: give cash handouts of $50,000 to aspiring Nigerian entrepreneurs. Yes, you read that last sentence correctly — but more about the Nigerian cash drop in due course. It is merely the most eye-catching in a stack of research and policy papers to conclude that an excellent cure for the problem of poverty is simply to give poor people money.

That idea seems almost naive. Instinctively, we tend to feel that victims of famines and earthquakes need food and shelter rather than inedible cash. We may feel, also, that cash will be wasted — stolen, spent on drink, frittered away on treats or siphoned off by grasping relatives. Even if the money is well spent, will it generate self-sustaining economic growth? Yet an increasing number of development policy types are reaching the conclusion that cash beats many of the alternatives.