Start-ups and other entrepreneurial ventures make a significant contribution to the US economy, particularly in the tech sector, where they comprise some of the largest and most influential companies. Yet for every high-profile, high-growth company like Apple, Facebook, Microsoft, and Google,...

This paper provides a synthesis of what is known about the determinants of output growth based on studying microeconomic data sets. It starts with a summary of the theoretical explanations which help reconcile heterogeneous performance observed across establishments in the same sector. The...