Tim James: >The marginal cost of toilet use must (in most cases) be approximately zero.<
If the question is -- as "marginal" seems to imply -- the cost of _one more_ user, then you're right. But, of course, the difference in usage between pay and non-pay would be far greater than that. In many venues, I would expect the porcelain equivalent of the Broken Windows effect to occur -- as we can see in many rural convenience stores. Michael Michael E. Etchison Texas Wholesale Power Report MLE Consulting www.mleconsulting.com 1423 Jackson Road Kerrville, TX 78028 (830) 895-4005
