A recent wave of literature, partly motivated by presidential campaign tax reform plans, analyzes tax expenditure limitation proposals. These reforms are often advanced not only, or even primarily, because they reduce distortions caused by favoritism for some types of expenditures over others....

Despite decades of research on mechanism design and on many practical aspects of cost-benefit analysis, one of the most basic and ubiquitous features of regulation as actually implemented throughout the world has received little theoretical attention: exemptions for small firms. These firms may...