Growth, investment and trade are the outcomes of the processes by which people with ideas start firms. But where does the productive capacity of firms come from? What are the barriers that prevent resources to flow to the firms with the greatest potential? Why is it that not all people that...

A fundamental question in monopolistic competition theory is whether the market allocates resources efficiently. This paper generalizes the Spence-Dixit-Stiglitz framework to heterogeneous firms, addressing when the market provides optimal quantities, variety and productivity. Under constant...