Market-type mechanisms have been introduced and are being explored for vari
ous environmental programs. Several existing programs, however, have not at
tained the cost savings that were initially projected. Modeling that acknow
ledges the role of transactions costs and the discrete, bilateral, and sequ
ential manner in which trades are executed should provide a more realistic
basis for calculating potential cost savings.
This paper presents empirical evidence on potential cost savings by examini
ng a market for the abatement of sediment from farmland. Empirical results
based on a market simulation model find no statistically significant change
in mean abatement costs under several transaction cost levels when contrac
ts are randomly executed. An alternative method of contract execution, gain
-ranked, yields similar results. At the highest transaction cost level stud
ied, trading reduces the total cost of compliance relative to a uniform sta
ndard that reflects current regulations. (C) 2001 Academic Press.