An attempt is made, in these few pages, to suggest how Stefano Zambelli's economic intuition is based on the work of distinguished unorthodox (and some enlightened orthodox) economists, emphasising the connection between the long-term and the short-term and the theory of imperfect competition.

We propose a new welfare criterion that allows us to rank alternative financial market structures in the presence of belief heterogeneity. We analyze economies with complete and incomplete financial markets and/or restricted trading possibilities in the form of borrowing limits or transaction...

Traditional finance is built on the rationality paradigm. This chapter discusses simple models from an alternative approach in which financial markets are viewed as complex evolutionary systems. Agents are boundedly rational and base their investment decisions upon market forecasting heuristics....