scholarly journals A Soul's View of the Optimal Population Problem

2021 ◽  
Author(s):  
David de la Croix ◽  
Matthias Doepke

Author(s):  
David de la Croix ◽  
Matthias Doepke


2021 ◽  
Author(s):  
David de la Croix ◽  
Matthias Doepke


2021 ◽  
Author(s):  
David de la Croix ◽  
Matthias Doepke


2020 ◽  
Vol 39 (5) ◽  
pp. 6419-6430
Author(s):  
Dusan Marcek

To forecast time series data, two methodological frameworks of statistical and computational intelligence modelling are considered. The statistical methodological approach is based on the theory of invertible ARIMA (Auto-Regressive Integrated Moving Average) models with Maximum Likelihood (ML) estimating method. As a competitive tool to statistical forecasting models, we use the popular classic neural network (NN) of perceptron type. To train NN, the Back-Propagation (BP) algorithm and heuristics like genetic and micro-genetic algorithm (GA and MGA) are implemented on the large data set. A comparative analysis of selected learning methods is performed and evaluated. From performed experiments we find that the optimal population size will likely be 20 with the lowest training time from all NN trained by the evolutionary algorithms, while the prediction accuracy level is lesser, but still acceptable by managers.





Author(s):  
Garrett Hardin

We fail to mandate economic sanity, writes Garrett Hardin, "because our brains are addled by...compassion." With such startling assertions, Hardin has cut a swathe through the field of ecology for decades, winning a reputation as a fearless and original thinker. A prominent biologist, ecological philosopher, and keen student of human population control, Hardin now offers the finest summation of his work to date, with an eloquent argument for accepting the limits of the earth's resources--and the hard choices we must make to live within them. In Living Within Limits, Hardin focuses on the neglected problem of overpopulation, making a forceful case for dramatically changing the way we live in and manage our world. Our world itself, he writes, is in the dilemma of the lifeboat: it can only hold a certain number of people before it sinks--not everyone can be saved. The old idea of progress and limitless growth misses the point that the earth (and each part of it) has a limited carrying capacity; sentimentality should not cloud our ability to take necessary steps to limit population. But Hardin refutes the notion that goodwill and voluntary restraints will be enough. Instead, nations where population is growing must suffer the consequences alone. Too often, he writes, we operate on the faulty principle of shared costs matched with private profits. In Hardin's famous essay, "The Tragedy of the Commons," he showed how a village common pasture suffers from overgrazing because each villager puts as many cattle on it as possible--since the costs of grazing are shared by everyone, but the profits go to the individual. The metaphor applies to global ecology, he argues, making a powerful case for closed borders and an end to immigration from poor nations to rich ones. "The production of human beings is the result of very localized human actions; corrective action must be local....Globalizing the 'population problem' would only ensure that it would never be solved." Hardin does not shrink from the startling implications of his argument, as he criticizes the shipment of food to overpopulated regions and asserts that coercion in population control is inevitable. But he also proposes a free flow of information across boundaries, to allow each state to help itself. "The time-honored practice of pollute and move on is no longer acceptable," Hardin tells us. We now fill the globe, and we have no where else to go. In this powerful book, one of our leading ecological philosophers points out the hard choices we must make--and the solutions we have been afraid to consider.



Author(s):  
Samuel Scheffler

Many discussions of future generations attempt to identify a satisfactory population axiology: a principle that would enable us to assess the relative value of total states of affairs that differ in population-related respects. Such an axiology would in turn supply the basis for a principle of beneficence, which would spell out our responsibilities for promoting optimal population outcomes. By contrast, the approach defended in this book is predominantly attachment-based. The reasons for caring about the fate of future generations discussed in previous chapters all depend on our existing values and evaluative attachments and on our conservative disposition to preserve and sustain the things that we value. This chapter appeals to the nature of valuing to clarify these forms of dependence, and it explores the contrast between the axiological and attachment-based approaches.





2021 ◽  
Author(s):  
Mohammad Meysami ◽  
Joshua P. French ◽  
Ettie M. Lipner


1981 ◽  
Vol 7 (1) ◽  
pp. 144
Author(s):  
G. McN. ◽  
Douglas Bolton
Keyword(s):  


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