Competition is not a natural state. Under it, firms become dissatisfied with performance and work to change the structure. What they seek is a structure that supports sufficient discipline to assure individual actions consistent with common interests. Often, the changes have been effected before...

The residential demand for natural gas is the subject of two recent articles in this journal.' Each used pooled time-series/cross-section data to estimate price and income elasticities as well as other relationships that determine the quantity of natural gas consumed by individual households or...