We analyze how frivolous patent-infringement claims made by non-practicing entities (NPEs, or "patent trolls") affect startups' ability to grow and create jobs, innovate, and raise capital. Our identification strategy exploits the staggered adoption of anti-troll laws in 32 U.S. states. The laws...

Private firms' ability to communicate confidentially with selected investors implies that valuation disagreements between firms and investors are larger at public firms than at private ones. Consistent with the notion that misvaluation concerns lead public firms to hoard cash to be able to...

We find that the bans on covered short sales, implemented in several countries during the financial crisis of 2008-09 improved market liquidity or at least had a neutral impact; a result we argue could be expected in theory, given a simple variation on the Diamond-Verrechia (1987) model. The...

We find that the bans on covered short sales, implemented in several countries during the financial crisis of 2008-09 improved market liquidity or at least had a neutral impact; a result we argue could be expected in theory, given a simple variation on the Diamond-Verrechia (1987) model. The...

We find that the bans on covered short sales, implemented in several countries during the financial crisis of 2008-09 improved market liquidity or at least had a neutral impact; a result we argue could be expected in theory, given a simple variation on the Diamond-Verrechia (1987) model. The...

We study how parent liability for subsidiaries' environmental cleanup costs affects industrial pollution and production. Our empirical setting exploits a Supreme Court decision that strengthened parent limited liability protection for some subsidiaries. Using a difference-in-differences...

This paper discusses empirical methods that rely on Russell 1000/2000 index assignments for identification. Using simulated data, the paper illustrates why the varying approaches reach conflicting conclusions about the effect of index assignment on a firm's ownership structure and corporate...

We study the effect of hedge fund activism on corporate environmental behaviors. Using plant-chemical level data from the EPA, we find that activism campaigns are associated with a 17 percent drop in emissions for chemicals at plants of targeted firms. Campaigns are associated with changes...