We examine the role of algorithmic traders (AT) in liquidity supply and demand in the 30 DAX stocks on the Deutsche Boerse in January 2008. AT represent 52% of market order volume and 64% of nonmarketable limit order volume. AT more actively monitor market liquidity than human traders. AT...

Practitioners allocate substantial resources to technical analysis whereas academic theories of market efficiency rule out technical trading profitability. We study this long-standing puzzle by designing a machine learning algorithm to search for profitable technical trading rules while...

We use the SEC Tick Size Pilot Program to show that stock liquidity reduces the cost of bank loans. Treated firms experience a 52 basis point increase in the cost of borrowing during the Tick Size Pilot Program; an effect that reverses when the program ends. We find similar results in a broad...

Exchange traded funds (ETFs) that track a specified index are a financial technology that has risen dramatically in the last two decades. We model an ETF's optimal index replication strategy and show that it involves underweighting or omitting illiquid index assets. Instrumenting for ETF trading...

We examine how liquidity in the equity market affects bank lending costs. An exogenous decrease in liquidity during the SEC Tick Size Pilot Program raises corporate bank borrowing costs; an effect that reverses when the program ends. We find similar results in a broad panel of firms using both...

We examine the real effects of stock market efficiency by analyzing how noise in stock prices affects the efficiency of capital allocation. Using data from 42 countries and a long time-series, we find that the efficiency of capital allocation across firms (the sensitivity of corporate investment...