We estimate the increment in Massachusetts Medicaid program costs attributable to smoking from December 20, 1991, to 1998. We describe how our methods improve upon earlier estimates of analogous costs at the national level. Current costs to the Massachusetts Medicaid program approximate the...

Small world networks have attracted much theoretical attention and are widely thought to enhance creativity. Yet empirical studies of their evolution and evidence of their benefits remain scarce. Using patent co-authorship data, we explore regional small-world structures and investigate the...

This paper analyzes changes in concentration levels in the U.S. Advertising and Marketing Services (A&MS) industry using publicly released data that have been largely ignored in past discussions of the industrial organization of this industry, namely those available from the U.S. Census Bureau's...

This paper investigates one of the largest pharmaceutical markets using a discrete choice model that allows marketing to affect product differentiation. Four main results emerge from an analysis of monthly panel data on antiulcer drugs from 1977 to 1993. Observed drug characteristics became less...