Manfred Max Neef describes Useful Economists versus Speculative Mathematicians (an important distinction indeed)

AMY GOODMAN: What do you think we need to change?
MANFRED MAX-NEEF: Oh, almost everything. We are simply, dramatically stupid. We act systematically against the evidences we have. We know everything that should not be done. There’s nobody that doesn’t know that. Particularly the big politicians know exactly what should not be done. Yet they do it. After what happened since October 2008, I mean, elementally, you would think what? That now they’re going to change. I mean, they see that the model is not working. The model is even poisonous, you know? Dramatically poisonous. And what is the result, and what happened in the last meeting of the European Union? They are more fundamentalist now than before. So, the only thing you know that you can be sure of, that the next crisis is coming, and it will be twice as much as this one. And for that one, there won’t be enough money anymore. So that will be it. And that is the consequence of systematical human stupidity. 
AMY GOODMAN: So, to avoid another catastrophe, collision, if you were in charge, what would you say has to happen? 
MANFRED MAX-NEEF: First of all, we need cultured economists again, who know the history, where they come from, how the ideas originated, who did what, and so on and so on; second, an economics now that understands itself very clearly as a subsystem of a larger system that is finite, the biosphere, hence economic growth as an impossibility; and third, a system that understands that it cannot function without the seriousness of ecosystems. And economists know nothing about ecosystems. They don’t know nothing about thermodynamics, you know, nothing about biodiversity or anything. I mean, they are totally ignorant in that respect. And I don’t see what harm it would do, you know, to an economist to know that if the beasts would disappear, he would disappear as well, because there wouldn’t be food anymore. But he doesn’t know that, you know, that we depend absolutely from nature. But for these economists we have, nature is a subsystem of the economy. I mean, it’s absolutely crazy