Demographic variables in demand systems: The case for generality

This paper provides evidence in favour of greater generality in the demographic demand literature. We propose two demographic demand procedures. One extends the Gorman model by allowing non additive interaction between overheads and Barten scaling. The other extends Price Scaling, by allowing the equivalence scale to vary with utility, and offers a test of Equivalence Scale Exactness (ESE). The rejection of ESE is robust to the assumed demand functional forms (RNLPS, QAIDS), to items chosen, and the estimation method (MLE, GMM). The results show that published cell averages yield well determined estimates of the demographic generalisation parameters.This paper was written during my visit to the UBC in Vancouver, Canada in 1992/93. I am grateful to two anonymous referees for their helpful remarks on an earlier version. The disclaimer applies.     

Supplier-managed inventory: schedule sharing

Supplier-managed inventory (SMI) is a methodology that provides a true win-win partnership between customers and suppliers. SMI supports flexibility for the customer to change schedules and flexibility to the supplier to decide when and how much to ship. All this is accomplished via electronic data interchange (EDI), which communicates the customer's gross requirements, inventory, and desired minimum/maximum inventory levels.     

A Comparison of HMO Efficiencies as a Function of Provider Autonomy

Current debates in the insurance and public policy literatures over health care financing and cost control measures continue to focus on managed care and HMOs. The lower utilization rates found in HMOs (compared to traditional fee‐for‐service indemnity plans) have generally been attributed to the organization's incentive to eliminate all unnecessary medical services. As a consequence HMOs are often considered to be a more efficient arrangement for delivering health care. However, it is important to make a distinction between utilization and efficiency (the ratio of outcomes to resources). Few studies have investigated the effect that HMO arrangements would have on the actual efficiency of health care delivery. Because greater control over provider autonomy appears to be a recurrent theme in the literature on reform, it is important to investigate the effects these restrictions have already had within the HMO market. In this article, the efficiencies of two major classes of HMO arrangements are compared using “game‐theoretic” data envelopment analysis (DEA) models. While other studies confirm that absolute costs to insurance firms and sponsoring companies are lowered using HMOs, our empirical findings suggest that, within this framework, efficiency generally becomes worse when provider autonomy is restricted. This should give new fuel to the insurance companies providing fee‐for‐service (FFS) indemnification plans in their marketplace contentions.     

A Comparison of Income and Expenditure Inequality Estimates: The Australian Evidence, 1975–76 to 1993–94

Using Australian unit record data this paper compares income and expenditure inequalities over the period 1975–76 to 1993–94. The study finds inconsistencies between the two inequality movements over much of this period. We also observe differences in the nature of income and consumption disparities. Both approaches show that the 'within group' inequality dominates the 'between group' component when the population is divided into household types. The inequality estimates are sensitive to the equivalence scale used as the household size deflator but not to the cost of living index used as the price deflator.     

Social decision rules are not immune to conflict

Why is rent-seeking so endemic in societies? Might it not be possible to design a Pareto-improving social decision rule that sidesteps the inefficient waste of resources resulting from conflict? We study this question for a multi-player contest. We assume that a benevolent planner knows the winning payoffs, the effectiveness of each rent-seeker, that the cost of expending resources is isoelastic, and that it is the same across all players. But she does not know the precise value of this elasticity. We show that this minimal lack of information leads to the impossibility of a Pareto-improving social decision rule, as long as there are at least four agents. Received: June 1999 / Accepted: January 24, 2000     

Dietary Diversity,Food Security and Undernourishment: The Vietnamese Evidence*

As is widely known, Vietnam experienced a rise in living standards and a decline in expenditure poverty during the first half of the 1990s. This paper extends this knowledge by providing evidence on the Vietnamese experience of food security, undernourishment and poverty from the late 1990s to the early part of the new millennium. The results suggest that poor households did not experience increases in food consumption, calorie intake and dietary diversity of the same magnitude as non‐poor households. Nevertheless, Vietnam experienced impressive reductions in both calorie deprivation and expenditure poverty at the turn of the century. Non‐poor households, in particular, experienced spectacular increases in calorie intake and dietary diversity during the period 1997/1998–2004. This paper also reports regression results which point to the role of urbanization and improvement in education levels in promoting dietary diversity and nutrient intake. The present study finds evidence of sharp regional differences in calorie intake and calorie costs, which suggests that the authorities should set provincial poverty lines, contrary to the current practice adopted by Vietnam's General Statistical Office.