Applying search theory to determine the feasibility of eradicating an invasive population in natural environments

The detectability of invasive organisms influences the feasibility of eradicating an infestation. Search theory offers a framework for defining and measuring detectability, taking account of searcher ability, biological factors and the search environment. In this paper, search theory concepts are incorporated into a population model, and the costs of search and control are calculated as functions of the amount of search effort (the decision variable). Simulations are performed on a set of weed scenarios in a natural environment, involving different combinations of plant longevity, seed longevity and plant fecundity. Results provide preliminary estimates of the cost and duration of eradication programs to assist in prioritising weeds for control. The analysis shows that the success of an eradication program depends critically on the detectability of the target plant, the effectiveness of the control method, the labour requirements for search and control, and the germination rate of the plant.     

Two-dimensional mapping of Asia Pacific destinations combining tourism and economic indicators

The present study aims to cluster five Asia Pacific destinations (Cambodia, Hong Kong, Indonesia, the Philippines, and Singapore) with respect to other countries according to the evolution of the main tourism and economic indicators over the period between 2000 and 2014. By assigning a numerical value to each country corresponding to its position, we summarize all the information into two components (“tourism expenditure and profitability of tourism activity” and “tourism development and economic growth”) using different multivariate techniques for dimensionality reduction. By means of perceptual maps, we find that the five Asia Pacific destinations can be clustered into three different groups: Hong Kong and Singapore, which are the most mature markets; Indonesia and the Philippines, with moderate growth rates in most variables; and Cambodia, with top positions in all variables, showing a huge potential in terms of growth and tourism development and the challenges derived therefrom.     

The nonobserved economy in the European Union

To better understand the share of the nonobserved economy (NOE) in the European Union, especially on the PIIGS, we estimate, through the multiple indicators multiple causes model, the path between 1980 and 2013. The model includes (i) the tax burden (disaggregated into direct and indirect taxes), a proxy of regulation burden, the unemployment rate and self-employment as causes of the NOE economy; (ii) the GDP and the labour force participation ratio as indicators of the NOE economy. In particular, the estimated weight of NOE as a percentage of official GDP was always higher in the PIIGS group.     

Scientific policy and free riders

This paper presents econometric evidence of the effects of knowledge capital and institutions on technology transfer funding. A model is proposed and fitted for 31 research units on agricultural, forestry, and food sciences in Catalonia, Spain from 1990 to 1996. We find a strong impact of knowledge capital and institutional variables on technology transfer funding. Considering administrative costs strengthens the main points of the model and in some cases greatly changes the results. In particular, we reject the hypothesis that administrative costs do not matter. We also find evidence of the existence of free-rider strategies and that increasing returns-to-scale economies exist when bidding for technology transfer funding.An earlier draft of this paper was completed while the author was a visiting scholar at Iowa State University. The author is grateful to Wallace Huffman, Todd Sandler, and Simon Vicary for comments. Financial support was provided by the Interministerial Commission for Science and Technology project, SEC96-2300, and the Interdepartmental Commission for Research and Technological Innovation project, SGR97-333.     

In Defense of DEFECT

The one-state machine that always defects is the only evolutionarily stable strategy in the machine game that is derived from the prisoners' dilemma, when preferences are lexicographic in complexity. This machine is the only stochastically stable strategy of the machine game when players are restricted to choosing machines with a uniformly bounded complexity. Journal of Economic Literature Classification Numbers: C70, C72.     

INTERNATIONAL LISTINGS, THE SECURITY MARKET LINE AND CAPITAL MARKET INTEGRATION: THE CASE OF US LISTINGS ON THE LONDON STOCK EXCHANGE

This paper examines for international capital market segmentation by testing for changes (both inter-temporally and inter-beta) in the parameters of the riskreturn pricing relationship caused by the listing of US stocks on the London Stock Exchange (LSE) between 1965 and 1987. It is hypothesized that international listings reduce the negative effects associated with barriers to international investments, help integrate world markets and therefore decrease internationally listed stock's required returns. Significant negative deviations from the Sharpe-Lintner (SL) pre-listing pricing relationship during the postlisting period are therefore expected, primarily caused by decreases in the intercept parameter. We find, in support of the hypothesis, significant negative deviations from the predictions of SL for our sample, although they do not appear to have an intertemporal dimension. These deviations are largely associated both with decreases in the value of the SL model's intercept parameter and with low beta firms, and point toward some integration benefits from US listings on the LSE.     

Resource allocation, equality of access and health

Based upon the experience of Tanzania, this paper relates resource allocation in the health sector to the output of health, by contrasting access to and utilization of available health services by urban and rural populations. The writer argues that increased health expenditures alone cannot yield an efficient health care return unless the additional expenditure is spread ‘thinly’, in keeping with the realities of population distribution, transport possibilities, and disease patterns in most poor countries. Detailed data are presented for recurrent and capital expenditures for health facilities at different levels, and the output of those institutions is considered in terms of the volume of services offered. Those services are then measured according to their utilization by urban and rural populations. Because referral systems are found to function only marginally, it is argued that further building of large hospitals is not justified in the present situation of most poor countries. Specifically, the writer describes the ways in which Tanzania is changing its inefficient and unjust health care system. The paper concludes that the major obstacles to change are not shortages of resources or technologic ignorance but social systems that do not place high value upon the health care needs of rural peasants. It is in this way that the professional and elitist interests of the few are often destructive of the needs of the many.     

Foreign Direct Investment and Trade: A Causality Analysis

In this article, we analyze the relationship between outward foreign direct investment (FDI) and exports, using Spanish quarterly data for the period 1977–1998, by means of Granger causality tests in a cointegration framework. Our results point to the existence of a relationship of complementarity between both variables, with Granger causality running in the short run from outward FDI to exports, and bilateral Granger causality in the long run.