Assessment of consumer research for a valuation of a quality-of-life policy

This paper evaluates the allocation, coordination, priority assignments and new directions in the research efforts towards a consumer policy. The formulation of a consumer policy is an essential component of a quality-of-life policy. It is shown how interdisciplinary efforts could foster this endeavor. The consumer welfare should be central to the political economy system. Thus a detailed analysis of the primary elements that interrelate to produce possible levels of welfare are examined. In depth consideration of the following five points consitute the bulk of the paper: (i) consumer choice and freedom, (ii) controls available to consumers over their environment, (iii) the demographic characteristics of consumer populations over the life-cycle, (iv) the interaction between the individual and the group emerging from the hierarchies of influence at the individual, group and society levels, (v) structure of the markets, degree of concentration and business practices related to sales. As a result of this analysis it can be concluded that several policy measure can redress the balance of power between consumers, business and government, however there is an urgent need for action by the consumers themselves. The initiative for effective social action in consumerism rests in the last resort with the consumers themselves. They can and do form coalitions which can be effective in influencing the course of events.     

A comparative study of the searching efficiencies of a parasite and a hyperparasite

Summary The searching efficiencies of a primary parasite (Diaeretiella rapae (McIntosh)) and a hyperparasite (Alloxysta brassicae (Ash.)) were investigated and compared. In both species, at all parasite densities, there was a curvilinear relationship (P<0.001) between the number of hosts parasitised and the host density. A linear regression (loga=logQ−m logP) was fitted for log area of discovery against log parasite density (P<0.001). The area of discovery for its immediate (i.e. primary) host (viz.Diaeretiella for the hyperparasite and aphid forDiaeretiella) is lower in the hyperparasite than in the primary parasite. InDiaeretialla both the searching efficiency and the mutual interference constant increased (but not significantly,P>0.05) in the presence of its males.     

Migration as a source of growth: The perspective of a developing country

This paper analyses the dynamics of migratory flows and growth in a developing economy. We show that when workers freely choose their location, some natives can rationally decide to return to their home country after they have accumulated a certain amount of knowledge abroad, while some prefer to stay permanently in the same economy (either at home or abroad). We point out that worker mobility can have an expansionary effect on the developing economy. Moreover, we show that in the long-run, as the sending economy develops, fewer natives are likely to emigrate and more migrants are likely to return. Received: 7 December 2000/Accepted: 25 April 2001     

Pareto improving transition from a pay-as-you-go to a fully funded pension system in a model of endogenous growth

In this paper we investigate the possibility of Pareto improving social security reforms within a framework of endogenous growth. Belan et al. (1998) propose a transition from a pay-as-you-go (PAYG) pension system to a system of savings–subsidization. We follow this approach and prove that a Pareto improving conversion from the PAYG system to a fully funded one is possible. Finally, we compare the subsidy system with the fully funded system and discuss the problem of implementing the transition to the fully funded system. Received: 07 March 1999/Accepted: 13 December 1999     

Stabilization of the population of a parasite on fruit by the population of a cleptoparasite

Summary When there exist two species such that one is a parasite on fruit and the other exploits the parasitized fruits, they must compete for a limited resource with each other. The relation betweenDacus cucurbitae andAtherigona orientalis is an example of such a situation. We raise a question whether the population of a parasite on fruit can be stabilized by the existence of the cleptoparasite of the parasite on fruit. The changes in their population densities are represented as a differential equation with time delayed parameters, which is deduced from the context of life histories of the two species. An index representing degree of overlapping of generations (g) is defined as an average oviposition period devided by the average preoviposition period, and the value is assumed to be the same in the two species. The stability of the system is classified by three parameters: the reproductive rate of the parasite on fruits (R), the survival probability of it through competition against the cleptoparasite (p), and the generation overlapping index (g). For small values ofg, e.g. less than some 0.5, the stability is determined mainly by a product ofRp: the values larger than 1 result in no equilibrium and infinite increase of both species, the values near 0 lead to large amplitude oscillations, and the intermediate values make stable equilibria or regular small oscillations. Asg takes the larger values, the stability region in the space (p, R) occupies the larger area. The model presented here is well adjusted to the fluctuating pattern of the population ofD. cucurbitae on Okinawa Is., and would also be applied to analysis of both hyperparasitisms and inquilin. This study was supported partly by Science Research Fund (No. 574092) from the Ministry of Education, Japan.     

Two and a half centuries of demographic history in a Bavarian village

Abstract A village genealogy containing family histories of couples married between 1692 and 1939 serves as the basis for a study of the demographic history of a Bavarian village. The past patterns of marriage, re-marriage, widowhood, illegitimacy, bridal pregnancy, marital fertility, family size, and birth intervals are examined. Both the age at marriage and illegitimacy increased and then declined during the nineteenth century, apparently in response to changes in restrictive marriage legislation. Differences in fertility for occupational groups were insignificant. Marital fertility remained extremely high before 1900 suggesting the absence of any substantial family limitation within marriage. A rise in marital fertility that occurred during the last half of the nineteenth century appears to result from a change in breast-feeding customs. The actual number of children surviving to maturity for most couples was kept quite low, however, through late marriage and high infant mortality. Only during the twentieth century are substantial declines in infant mortality and fertility evident.     

Lesbian struggle against a pillow or a wall: a Dutch-American dialogue

A dialogue between two lesbian women is conducted in an effort to demonstrate the differences in attitude and level of tolerance towards lesbians in the United States as compared to those in The Netherlands. Their observations suggest there are positive and negative aspects to being a lesbian in both countries and they hope that the positive benefits in both countries will combine.     

Portrait of a Woman Artist

The analysis of the film Camille Claudel works to uncover the textual negotiations and sources of viewing pleasure rhetorically constructed into the cinematic representation of the film's subject. I argue that female viewers, in particular, are presented with a paradoxical viewing experience as the film both invites identification with Claudel, the film's subject, at the same time that it creates a sense of distance from the woman artist through her representation as an object of the filmic gaze. I conclude that these competing images may be seen as both ideologically interesting to female viewers and simultaneously challenging for feminist ideals.     

Toward a theory of restraint

Consumption largely remains a black box in the population, environment, and global change debates. The dominant perspective takes insatiability as axiomatic and assumes that reduced consumption will only happen through scarcity or the impositions of external authority. Yet humans often exhibit resource limiting behavior that is not the result of external controls nor is it altruistic or aberrant. This article develops the concept ofrestraint as an evolutionarily and culturally significant behavior, yet one that in modern times has been relegated to a regressive, if not trivial, status. The article defines restraint, hypothesizes its historical and evolutionary roots, lays out the conditions under which it can occur, and develops a theoretical parallel to cooperation in international relations theory.     

单因素约束下的坡市人口合理容量测算——以成都市为例

为制定城市发展规划，以实现城市可持续发展的目标，需对城市合理人口容量进行测算。考虑人口容量与经济、社会、自然的关系，选取国民生产总值、经济弹性系数、产业发展、耕地资源、水资源为制约人口容量的制约因素．测度各因素制约下的人口合理容量，最后应用“木桶原理”得到同时满足各个制约因素的人口合理容量。     

Asymptotic properties of a human age distribution under a continuous net maternity function

A useful and intuitively appealing proposition in theoretical demography asserts that the age distribution of a closed human populationis asymptotically independent of this shapein thedistant past, and is therefore exclusively determined by the historyof fertility and mortalitythat has prevailed during a reasonably long period of time. The mathematical foundations of this ergodic principle arelaid out in this article and thedetailsof its proofareworked out afteremphasizing an intuitive understanding of the process through which an age distribution tends to "forget" its past. The tendency for an unchanging schedule of vital ratesto produce a fixed agestructure in a closed population, is presented as a corollary of the main proposition dealt with in this article.     

Between a rock and a hard place: The evaluation of demographic forecasts

Forecasting, in general, has been described as an unavoidable yet impossible task. This irony, which comprises the ‘rock’ and the ‘hard place’ in the title, creates a high level of cognitive dissonance, which, in turn, generates stress for those both making and using forecasts that have non-trivial impacts. Why? Because the forecasted numbers that are invariably accorded a high degree of precision inexorably reveal their inevitable imprecision when the numbers forming the actuality finally take place and the numbers comprising the forecast's errors are precisely measured. The current state of the art in demography for dealing with the ‘rock’ and the ‘hard place’ is a less-than-successful strategy because it is based on an acceptance of accuracy as the primary evaluation criterion, which is the source of cognitive dissonance. One way to reduce cognitive dissonance is to change the relationship of the very cognitive elements creating it. We argue that forecast evaluations currently focused on accuracy and based on measures like RMSE and MAPE be refocused to include utility and propose for this purpose the ‘Proportionate Reduction in Error’ (PRE) measure. We illustrate our proposal with examples and discuss its advantages. We conclude that including PRE as an evaluation criterion can reduce stress by reducing cognitive dissonance without, at the same time, either trivializing the evaluation process or substantively altering how forecasts are done and presented.     

Application of a nonlinear mathematical model to data on a successful theraputic intervention

A mathematical model is applied to happiness and mood data from a successful group therapy intervention with elderly nursing home residents (Rattenbury and Stones, 1989). The model permits estimations of acute environmental change within and across therapy sessions, and the comparison of such estimates with the changes in happiness from before to after the total intervention. The findings show intervention success (i.e., the change in happiness) to correlate with across session changes, and particularly those in the basal (presession) acute environment, but with no correlation between therapeutic success and within session changes. These findings suggest a positive facilitation to the chronic environment during the progression of therapy.     

Persistence of a fig wasp population and evolution of dioecy in figs: a simulation study

The relationship between fig trees and their pollinator wasps is a well-known example of species-specific obligate mutualism. In this article we present a stochastic model of this mutualistic system, referring to data on a dioecious fig (Ficus schwarzii) in Borneo, and examine the conditions for the persistence of a wasp population for a given period. (1) When the average duration of the flowering interval of fig trees is short, even a small fig population can sustain a wasp population successfully. A population whose average period of flowering cycle is half that of another population can sustain a wasp population with a number of trees less than half of the other population. (2) The wasp survival rate (WSR) is higher when (a) the variation of the interval periods of fig flowering is smaller, (b) the fig population size is larger, and (c) figs can prolong their receptivity to wait for a wasp if no wasps are available. (3) WSR is predictable from the average proportion of the fig's receptive phases, in which wasps are available, to their total receptive phases. (4) The persistence period of a wasp population increases exponentially with the number of fig trees. Based on these results we propose a new hypothesis, as a possible scenario, on the evolution of dioecy from monoecy in Ficus. Received: November 13, 1998 / Accepted: July 14, 1999