This paper analyses the links between advances in financial technology, investors' sophistication, and their financial portfolios' composition and returns. We develop a simple portfolio choice model under asymmetric information and derive some theoretical predictions. Using detailed micro data...

Mean-variance portfolio optimization models are sensitive to uncertainty in risk-return estimates, which may result in poor out-of-sample performance. In particular, the estimates may suffer when the number of assets considered is high and the length of the return time series is not sufficiently...

We develop a macroeconomic framework in which firms are large and have market power with respect to both products and labor. Each firm maximizes a share-weighted average of shareholder utilities, which makes the equilibrium independent of price normalization. In a one-sector economy, if returns...

Growing economic inequality and wage stagnation have raised serious social justice concerns, igniting a broad debate on their causes and possible solutions. Antitrust scholars have discussed a number of approaches, including Professors Herbert Hovenkamp and Ioana Marinescu’s recommendation of...