The idea is to let the figures carry the message. There should be little or no need for text that describes what is in a figure. Extended descriptions in the figures and substantial use of inserts in the figure itself should be the source of explanation. The references should be the source of the details of parameters, numbers of experiments and exactly what was done. The contributions should simply state the essence of what the data show and allow the references to convince the audience that it is true. We are not seeking new material and we are not seeking abstracts of single papers. While we have no necessary objection to either, we want to emphasize patterns of results. Where else has the phenomena been observed? Who else has studied similar phenomena? We assume that in many cases the contributions will be centred on the author's own results or centred around topics of interest to the author. For more detailed information on the Handbooks in Economics series, please see our home page on http://www.elsevier.nl/locate/hes