-post and ex-ante types), of cancellation fees and of transaction taxes on asset price volatility and on the occurrence and … volatility and the frequency of flash crashes. However, these policies also imply a longer duration of flash crashes. Furthermore …, the introduction of an ex-ante circuit breaker markedly reduces price volatility and removes flash crashes. In contrast …

dynamics. Our main goal is to investigate whether high-frequency trading exacerbates market volatility and generates flash … that the presence of high-frequency trading increases market volatility and plays a fundamental role in the generation of …