Paper to be presented at the DRUID 2012 on June 19 to June 21 at CBS, Copenhagen, Denmark, Does Size Matter? Parallel Search and the Efficacy of Experiential Learning Hart Posen University of Michigan Ross School of Business hposen@umich.edu Dirk Martignoni University of Zurich Department of Business Administration dirk.martignoni@gmail.com Daniel Levinthal University of Pennsylvania Wharton School levinthal@wharton.upenn.edu Abstract Experiential learning is a central idea in the management literature ? and its general efficacy is a taken-for-granted element of management thought. However, we also know that history is not generous with experience, and this experience constraint engenders errors and myopia in the process of experiential learning. We consider the implications of relaxing the experience constraint ? by increasing the number of agents in the organization to make possible parallel search. Employing a computational model, we find three stylized facts about larger, less constrained, organizations: (a) they explore less than smaller organizations, (b) they are less likely to discover the very best alternative, and (c) they