Estimates of the demand for medical care under different functional forms

We estimate price and income elasticities from a linear, log-linear, and the almost ideal demand model (with and without an adjustment for selectivity bias) in an effort to show that special attention should be paid to the underlying assumptions of consumer behaviour when estimating a medical care demand model. The literature on medical care utilization is extended by incorporating two major components of spending as separate demands in a system of medical care spending. We find that estimates of elasticities vary depending on the functional form of the estimating equation, thus questioning the usefulness for policy purposes of single estimates of elasticities.     

Testing for deliberate underpricing in the IPO premarket: a stochastic frontier approach

We reevaluate the IPO underpricing phenomenon using the stochasticfrontier methodology. The advantage of the stochastic frontieris that it can be used to measure the level of deliberate underpricingin the premarket without using after-market information. Thisis accomplished through the estimation of a systematic one-sidederror term that measures 'inefficiency' or the difference betweenthe maximum predicted offer price and the actual offer price.Data for the analysis are comprised of 1,035 IPOs of commonstock issued by firm commitment between 1975 and 1984. IPOsappear to be deliberately underpriced in the premarket in bothhot-market and nonhot-market periods. Moreover, the determinantsof the maximum IPO price have different effects in the two timeperiods.