Allais' trading process and the dynamic evolution of a market economy

Summary. We construct a simple trading process that is based on the maximization, at each stage, of the total distributable surplus. We show that this process converges to a Pareto optimal allocation.     

Are Consumers International? A Study of CSR,Cross-Border Shopping,Commitment and Purchase Intent among Online Consumers

The purpose of this study is to investigate purchase intent in online marketplaces as an international phenomenon. A profile of the international online consumer is established, taking into account factors such as indicators of socio-economic development of their home countries. A structural model is analyzed using LISREL, testing the importance of CSR, the propensity to buy from international online vendors and commitment with purchase intent as the dependent variable. A cross-national dataset of 804 respondents from 57 countries is analyzed, showing that CSR activities alone do not increase purchasing intent, but they do when mediated by commitment.     

Towards a New Flashmob Unionism: The Case of the Fight for 15 Movement

Unionism renewal has been described as a hybridization process between ‘old’ and ‘new’ logics. Understanding how these two potentially conflicting logics might be combined, however, has so far received little attention. Through the study of the Fight for 15 (FF15) movement, we investigate how the old ‘collectivist’ logic of action-oriented unions and the new ‘connectivist’ logic are being hybridized. To do so, we develop a mixed-methods approach that combines interviews with Twitter data. We evidence three mechanisms through which the collectivist and connectivist logics are being hybridized, namely, imbrication, camouflage and cumulation. We suggest to name ‘flashmob unionism’ the hybrid logic of FF15, characterized by apparently spontaneous mobilizations, a loosely co-ordinated organization, a personalized communication and online virality.     

Unawareness and bankruptcy: A general equilibrium model

Summary. We present a consistent pure-exchange general equilibrium model where agents may not be able to foresee all possible future contingencies. In this context, even with nominal assets and complete asset markets, an equilibrium may not exist without appropriate assumptions. Specific examples are provided. An existence result is proved under the main assumption that there are sufficiently many states that all the agents foresee. An intrinsic feature of the model is bankruptcy, which agents may involuntarily experience in the unforeseen states. Received: April 23, 1997; revised version: May 19, 1997     

Existence of equilibrium in an OLG model with production and altruistic preferences

Summary. This note deals with the existence and uniqueness of a non-trivial steady-state equilibrium in an overlapping generations (OLG) model with productive capital and altruistic agents. We establish a necessary and sufficient condition for operative bequests which extends Abel (1987) and Weil (1987). Interestingly, we prove that the OLG model with production and altruistic agents always experiences a non-trivial steady-state equilibrium. Received: July 16, 1998; revised version: January 29, 1999     

Is GDP a Relevant Social Welfare Indicator? A Savers–Spenders Theory Approach

The use of GDP as the main index of progress and welfare of a country has been the subject of a long debate among economists. Using and extending the savers–spenders theory, we analyse the theoretical relationship between GDP and the welfare of a society. This analysis is undertaken using several different overlapping generations models which all take into account the great heterogeneity of consumer behaviour observed in the data (different labour supply choices, different degrees of altruism and/or different degrees of impatience to consume). The results indicate that GDP (per capita) is often a relevant index and is always a decent social welfare indicator.     

Is the ladder sticky? Measuring semi-parametrically state dependence in earnings mobility

Employing the U.S. data for the 1990’s, we disentangle state dependence from unobserved heterogeneity in earnings mobility. The fixed effects dynamic multinomial logit utilized to model earnings quintiles dynamics fits the data very well, much more so than the autocorrelated dynamic ordered probit. Unordered models should thus be preferred to study earnings mobility. State dependence is found to be significant. It has a protective (anti-fall) effect at the top of the distribution and a detrimental (anti-rise) effect at the bottom. Consequently, the difficulty of climbing the ladder is not exclusively a question of individual characteristics. Public policies could thus be implemented to improve information about individuals’ ability and job offers, and to design more efficient wage-setting institutions.     

Cost-effectiveness of golimumab for the treatment of patients with moderate-to-severe ulcerative colitis in Quebec using a patient level state transition microsimulation

Objective: To conduct cost-effectiveness analyses comparing the addition of golimumab to the standard of care (SoC) for treatment of patients with moderate-to-severe ulcerative colitis (UC) who are refractory to conventional therapies in Quebec (Canada).

Methods: An individual patient state transition microsimulation model was developed to project health outcomes and costs over 10 years, using a payer perspective. The incremental benefit estimates for golimumab were driven by induction response and risk of a flare. Flare risks post-induction were derived for golimumab from the PURSUIT maintenance trial and extension study, while those for SoC were derived from the placebo arms of the Active Ulcerative Colitis Trials (ACT) 1 and 2. Other inputs were derived from multiple sources, including retrospective claims analyses and literature. Costs are reported in 2014 Canadian dollars. A 5% annual discount rate was applied to costs and quality-adjusted life-years (QALYs).

Results: Compared with SoC, golimumab was projected to increase the time spent in mild disease or remission states, decrease flare rates, and increase QALYs. These gains were achieved with higher direct medical costs. The incremental cost-effectiveness ratio for golimumab vs SoC was $63,487 per QALY.

Limitations: The long-term flare projections for SoC were based on the data available from the ACT 1 and 2 placebo arms, as data were not available from the PURSUIT maintenance or extension trial. Additionally, the study was limited to only SoC and golimumab, due to the availability of individual patient data to analyze.

Conclusion: This economic analysis concluded that treatment with golimumab is likely more cost-effective vs SoC when considering cost-effectiveness acceptability thresholds from $50,000–$100,000 per QALY.     

Beliefs and Pareto Efficient Sets: A Remark

We show that, in a two-period economy with uncertainty in the second period, if an allocation is Pareto optimal for a given set of beliefs and remains optimal when these beliefs are changed, then the set of optimal allocations of the two economies must actually coincide. We identify equivalence classes of beliefs, giving rise to the same set of Pareto optimal allocations. Journal of Economic Literature Classification Numbers: D51, D61.