We examine whether recent regulatory reforms requiring majority board independence reduce the extent of earnings management. Firms that did not have a majority of independent directors before the reforms (referred to as noncompliant firms) are required to increase their board independence. We find that, while noncompliant firms on average do not experience a significant decrease in earnings management after the reforms compared to other firms, noncompliant firms with low information acquisition cost experience a significant reduction in earnings management. The results are similar when we examine audit committee independence and when we use alternative proxies for information acquisition cost and earnings management. These findings indicate that independent directors’ monitoring is more effective in a richer information environment.

We model competition for liquidity provision between high-frequency traders (HFTs) and slower execution algorithms (EAs) designed to minimize investors’ transaction costs. Under continuous pricing, EAs dominate liquidity provision by using aggressive limit orders to stimulate HFTs’ market orders. Under discrete pricing, HFTs dominate liquidity provision if the bid-ask spread is binding at one tick. If the tick size (minimum price variation) is not binding, EAs choose between stimulating HFTs and providing liquidity to non-HFTs. Transaction costs increase with the tick size but can be negatively correlated with the bid-ask spread when all traders can provide liquidity.