The Nobel Prize Joseph Stiglitz happened to be in Madrid, and he attended the Forum organized by the 15-M protesters. He said that "bad ideas cannot be replaced by the absence of ideas, but must be changed by good ideas. To integrate them in the public debate requires organization and leadership. It's going to be a difficult struggle, because those bad ideas are well established in the dominant economic discourse, but now we have a great opportunity to unite economic science with social commitment and justice and thus achieve a new economy. I wish you the best of luck."