Recent regulatory changes permitted natural gas pipelines to become ''
open access transporters. This change in pipeline carrier status disso
lved regulatory barriers to markets. This paper describes the institut
ions that were developed to support exchange in gas markets and observ
es and evaluates their emergence, evolution, and performance. The inst
itutional and empirical evidence reveals that gas markets rapidly emer
ged with the dissolution of regulatory barriers. Spot gas prices conve
rged and became highly correlated. A national market for natural gas d
eveloped within four years.