The financial markets have changed quite fundamentally in the last a few decades, yet the measures we use to regulate them have not really changed at all. The market patterns of high frequency trading, computer generated activity and short-termism are now well entrenched, and will be difficult...

We present a stock market model that quantitatively replicates the joint behavior of stock prices, trading volume and investor expectations. Stock prices in the model occasionally display belief-driven boom and bust cycles that delink asset prices from fundamentals and redistribute considerable...

We investigate the impact of the French 2012 financial transaction tax on trading volumes and volatility. We extend empirical research by analyzing announcement and short-run treatment effects, migration effects, and long-run volatility measures. We find a strong short-run impact on trading...