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51.
Marylee S. Murphy Ludek Vecsey Erik O. Sevre David A. Yuen 《International Review of Economics》2000,5(4):1-10
We have conducted numerical experiments for mantle convection in an axisymmetrical spherical-shell geometry from Rayleigh numbers ranging from three million to 10 billion for a purely basal heating configuration. We focus on the development of secondary instabilities developed from plumes and compare them with laboratory experiments by Skilbeck and Whitehead (1978) and Whitehead, (1982). For Rayleigh numbers between around thirty million to one billion, a string of these secondary instabilities can develop from a single plume. Analysis of the spectrum of wavelength associated with the fold instabilities shows that there is a window in the Rayleigh number between around ten million and one bilion where these secondary folding instabilities would develop. These results, when applied to the upper mantle, may explain the formation of hot-spots in a turbulently convecting upper-mantle with a Rayleigh number greater than ten million. 相似文献
52.
We specify a vector autoregression (VAR) model for the U.S. for 1980–2008 to investigate the statistical causal relationships between private non-residential fixed investment, the effective Federal funds rate, personal consumption expenditures, nonfinancial corporate profits, and the nonfinancial corporate credit market debt to test the validity of macroeconomic relationships in a macro model. The VAR utilizes the Toda-Yamamote procedure to test for Granger causality. Our preliminary results show that the transmission mechanism does not work as expected; we find that fixed investment depends on the level of demand in the economy and profits but not on the interest rate. This casts doubt on the usual assumptions about how the monetary transmission mechanism is expected to work. The second part of the paper investigates the effects of the change in the monetary regime towards low and stable interest rates, a policy pursued by the U.S. Fed since the beginning of the 1990s. We find that the new monetary policy regime has the following effects: (1) our VAR model does not support the hypothesis that low interest rates lead to higher fixed nonresidential investment; (2) low interest rates led to a search for higher yields through increasing risk, and (3) they led to an increase in the demand for securitized assets, especially mortgage-backed securities, which eventually resulted in a housing bubble. The overall results therefore raise doubts about the effectiveness of low interest rates as a policy regime designed as a component of a counter-cyclical policy. 相似文献
53.
The knowledge spillover theory of entrepreneurship 总被引:3,自引:0,他引:3
According to the knowledge spillover theory of entrepreneurship, the context in which decision-making is derived can influence one’s determination to become an entrepreneur. In particular, a context that is rich in knowledge generates entrepreneurial opportunities from those ideas. By commercializing ideas that evolved from an incumbent organization via the creation of a new firm, the entrepreneur (human capital) not only serves as a conduit for the spillover of knowledge, but also for the ensuing innovative activity and enhanced economic performance through resource allocation. The knowledge spillover theory of entrepreneurship brings together contemporary theories and thoughts of entrepreneurship with prevailing theories of economic growth, geography, and strategy and therefore explains not just why some people choose to become an entrepreneur, but also why this matters significantly for the economy and society. 相似文献
54.
Using panel data for Norwegian manufacturing, we revisit 'the increasing returns to scale puzzle' for labour inputs. We consider the response of the input of white-collar workers, blue-collar workers, and blue-collar worker hours to permanent changes in output. Permanent and temporary changes in output are treated as latent variables. We compare OLS, IV, and GMM estimates of the response elasticities and conclude that the distinction between permanent and temporary changes is essential. Our GMM estimates suggest that the 'increasing returns to scale puzzle' remains for all measures of the labour input also when we consider their response to permanent changes in output. For materials, the output response indicates approximately constant returns to scale. This suggests non-homotheticity of the production technology.
JEL classification : C 23; J 23 相似文献
JEL classification : C 23; J 23 相似文献
55.
一、简介
Weinstein等人阐述了QALY的概念、方法及暗含的假设。尽管引起了许多有趣的争论,但本文仅限于对我们认为最具挑战性的四个争论点进行研究。 相似文献
56.
57.
This paper investigates consumer responses to new smart products. Due to the application of information technology, smart products are able to collect, process, and produce information and can be described as “thinking” for themselves. In this study, 184 consumers respond to smart products that are characterized by two different combinations of smartness dimensions. One group of products shows the smartness dimensions of autonomy, adaptability, and reactivity. Another group of smart products are multifunctional and able to cooperate with other products. Consumer responses to these smart products are measured in terms of the innovation attributes of relative advantage, compatibility, observability, complexity, and perceived risk. The study shows that products with higher levels of smartness are perceived to have both advantages and disadvantages. Higher levels of product smartness are mainly associated with higher levels of observability and perceived risk. The effects of product smartness on relative advantage, compatibility, and complexity vary across product smartness dimensions and across product categories. For example, higher levels of product autonomy are perceived as increasingly advantageous whereas a high level of multifunctionality is perceived disadvantageous. The paper discusses the advantages and pitfalls for each of the five product smartness dimensions and their implications for new product development and concludes with a discussion of the limitations of the study and suggestions for further research. 相似文献
58.
Erik Offerdal 《De Economist》1991,139(2):169-185
Summary This paper analyzes the potential welfare gains to the Norwegian economy of implementing a tax reform that broadens the tax base and lowers tax rates on capital income. For this purpose a dynamic general equilibrium model where agents have perfect foresight is developed. The model is highly aggregate, with only one production sector and one household sector, but it incorporates a very detailed treatment of the taxation of capital income. This includes a two-way classification of capital assets into three ownership classes: corporate, non-corporate and household, and across two types of assets: long-lived and short-lived. This suffices to capture those elements of the Norwegian tax code that give rise to the most important distortions, both intratemporally and intertemporally.I have benefited greatly from detailed comments from Don Fullerton, A. Lans Bovenberg and an anonymous referee. Please direct all correspondence to the author to: Fiscal Affairs Department, International Monetary Fund, 700 19th Street, N.W., Washington, D.C. 20431. 相似文献
59.
The increasing number of human health problems caused by the use of pesticides serves as a warning to countries to develop preventive programs Developing countries, however, are concerned about the effect of such programs on household incomes. With Indonesia as a case study, this paper presents a procedure to broaden a Social Accounting Matrix to include the impact of agricultural pesticide use on human health This approach utilises the Constrained Fixed Price Multiplier method to analyse the effect, on the household incomes of different socio-economic classes, of government programs that are designed to reduce human pesticide-related illnesses The results show that reducing such illnesses through the Safe Use of Pesticides program or the Integrated Pest Management program induces a more equal income distribution. 相似文献
60.
Alain P. Chaboud Benjamin Chiquoine Erik Hjalmarsson Mico Loretan 《Journal of Empirical Finance》2010,17(2):212-240
Using two newly available ultrahigh-frequency datasets, we investigate empirically how frequently one can sample certain foreign exchange and U.S. Treasury security returns without contaminating estimates of their integrated volatility with market microstructure noise. Using the standard realized volatility estimator, we find that one can sample dollar/euro returns as frequently as once every 15 to 20 s without contaminating estimates of integrated volatility; 10-year Treasury note returns may be sampled as frequently as once every 2 to 3 min on days without U.S. macroeconomic announcements, and as frequently as once every 40 s on announcement days. Using a simple realized kernel estimator, this sampling frequency can be increased to once every 2 to 5 s for dollar/euro returns and to about once every 30 to 40 s for T-note returns. These sampling frequencies, especially in the case of dollar/euro returns, are much higher than those that are generally recommended in the empirical literature on realized volatility in equity markets. The higher sampling frequencies for dollar/euro and T-note returns likely reflect the superior depth and liquidity of these markets. 相似文献