TY - JOUR ID - eprints639 SP - 574 VL - 5 SN - 1542-4766 JF - Journal of the European Economic Association Y1 - 2007/// PB - MIT Press A1 - Pammolli, Fabio A1 - Buldyrev, Sergey V. A1 - Growiec, Jakub A1 - Riccaboni, Massimo A1 - Stanley, H. Eugene AV - none EP - 584 N2 - We refer to the framework developed by Ijiri and Simon (1977) and to the notion of independent submarkets (Sutton 1998) to provide a simple candidate explanation for the shape of the firm growth distribution based on a model of proportional growth at the level of both the introduction of new products by firms and their size dynamics. We exploit the features of a unique longitudinal data set which covers the entire distribution of products and firms in the worldwide pharmaceutical industry to test the model at different levels of aggregation as well as at different time lags. Econometric investigations show that the model's predictions are in good agreement with empirical evidence. (JEL: L11, L65) TI - The Growth of Business Firms: Facts and Theory UR - http://dx.doi.org/10.1162/jeea.2007.5.2-3.574 IS - 2-3 ER -