This paper documents that options held from one expiration date to the next achieve significantly lower returns when there are four versus five weeks between expiration dates. The average return differential ranges from 12 basis points per week for delta-hedged put portfolios to 89 basis points...

We consider a firm's competitiveness based on the manner by which other firms mention it on their 10-K filings. Using all public firm filings simultaneously, we implement a PageRank-type algorithm to produce a dynamic measure of firm competitiveness, denoted C-Rank. A high-minus-low C-Rank...