Unorthodox Economic Dynamics: A Tribute to Dick Day

This is a tribute to Dick Day, who had a vision of economics which was ahead of his time. I give a short personal account of those of his interests: economic dynamics, rationality, the applications of catastrophe theory and computational models. I describe the interests that we had in common, particularly in learning and herd behavior. He was a worthy member of the distinguished and pioneering group which included Herb Simon and Reinhard Selten.