旅客行为时间价值的Logit计算模型改进研究

本文详细分析了旅客行为时间价值的影响因素,并在此基础上分析了用Logit模型确定旅客行为时间价值的理论方法。本文尝试对原有的计算模型进行改进,将旅客收入这一变量引入Logit模型,分析旅客收入对旅客出行决策的影响,以更准确地估测旅客时间价值、提高投资决策的准确性。     

Longevity and Life‐cycle Savings*

We add health and longevity to a standard model of life‐cycle saving and show that, under plausible assumptions, increases in life expectancy lead to higher savings rates at every age, even when retirement is endogenous. In a stationary population these higher savings rates are offset by increased old age dependency, but during the disequilibrium phase, when longevity is rising, the effect on aggregate savings rates can be substantial. We find empirical support for this effect using a cross‐country panel of national savings rates.     

Social Security,Government Finance,and Savings*

This paper considers the impact of social security and the government financing mix on saving behaviour and aggregate economic activity. The theoretical argument for the neutrality of these actions is shown to have validity only if we consider the economy as behaving like a composite individual. Particular individuals do not face the same marginal rates of substitution and transformation as the hypothetical composite, due to corner solutions, illusions, and important distribution effects. Empirically, neutrality for the whole economy depends on the relative strengths of the offsetting forces faced by the individuals. Our findings with Australian data suggest that neither the level of aged pensions, nor the government financing mix, have substantial real effects on aggregate saving behaviour.     

Aging,Savings, and Public Pensions in Japan*

We analyze the impact of population aging on Japan's household savings rate and on its public pension system and the impact of that system on Japan's household savings rate and obtain the following results: first, the age structure of Japan's population can explain the level of, and past and future trends in, its household savings rate; second, the rapid aging of Japan's population is causing Japan's household savings rate to decline and this decline can be expected to continue; third, the pay‐as‐you‐go nature of the public pension system, combined with rapid population aging, created considerable intergenerational inequities and increased the savings rates of cohorts born after 1965, which in turn slowed the decline in Japan's household savings rate; and fourth, the 2004 public pension reform alleviated the intergenerational inequities of Japan's public pension system somewhat but will in the long run exacerbate the downward trend in Japan's household savings rate.     

The Savings Ratio and Financial Repression in Trinidad and Tobago *

This paper investigates the hypothesis financial repression in the context of the Determinates of the private savings ratio in Trinidad and Tobago, using the Multivariate, cointegration time-series methodology. Four alternative proxies are Used to represent financial repression, including the real interest rate, the real interest Rate differential between the world and domestic economy and two alternative Measures of exchange rate misalignment, We find that there is strong evidence to Support the hypothesis of financial repression in Trinidad and Tobago over the sample Period and that financial liberalization may significantly enhance the growth of real Per capita income. [E2, F4, O1]     

Rotating Savings and Credit Associations When Participants are Risk Averse*

We model rotating savings and credit associations (Roscas) among risk‐averse participants who experience privately observed income shocks. A random Rosca is not advantageous, whereas a bidding Rosca is if temporal risk aversion is less pronounced than static risk aversion. The payoff scheme of a bidding Rosca facilitates risk sharing in the presence of information asymmetries. The risk‐sharing performance of a simple arrangement where a group of homogenous individuals runs several bidding Roscas simultaneously is as good as that of a linear risk‐sharing contract, and is more enforceable because it carries a fixed rather than a variable contribution.     

International Trade and the Value of Time

I discuss a generalized Heckscher–Ohlin–Vanek (HOV) model in which consumption requires time as well as money (as in Becker's theory of the allocation of time) and the amount of work that a worker can do per unit of time—her “ability”—varies from country to country. High ability implies high income per hour, which implies a high value of time and, therefore, high consumption of the good that is more “time‐saving.” Therefore, if domestic production of this good is not commensurately high, it would have to be imported. In this way, I demonstrate that international differences in worker ability constitute an independent source of gains from trade. The model is able to explain several observed features of North–South trade that are not explained by the HOV model. The theoretical possibility of a Leontief paradox‐type trade pattern is also demonstrated.     

Spending Time and Money within the Household*

We consider, both theoretically and empirically, the allocation of time and money within the household. The research question is whether a married person who enjoys more leisure than their partner also receives more consumption (which seems to indicate the outcome of power within the household) or receives less consumption (which seems to indicate differing intrahousehold preferences). We develop a simple parametric structural model with household production that is tested on survey data. We find that relative wages have an impact on power. For leisure, this effect is dominated by a conventional wage effect, in which the partner who has the higher wage takes less leisure.     

Determinants of International Trade Flows in Travel and Passenger Services*

In the past decade there has been a great increase in interest in trade in services. This paper estimates the determinants of trade flows for two service industries, travel and passenger transportation services, for 16 OECD countries Traditional and more recent models of import demand and demand for export functions are utilized The empirical results indicate similarity between trade in goods and trade in services. Price competitiveness is an important factor in determining the trade flows in travel services and like trade in manufactured goods, exchange rate variations have some influence on the volume of travel and passenger transportation services     

Cost Savings From Generation and Distribution with an Application to Italian Electric Utilities*

In the last decade, the European Commission promoted a new regulatory framework aiming at a gradual liberalization of the energy markets. The introduction of competition among generators implies the need to separate generation from transmission and distribution activities. However, if savings can be reached by operating at different stages, vertical separation would increase the costs of providing power. This paper tests for the presence of economies from vertical integration on a sample of Italian local electric utilities and finds evidence of both multi-stage economies of scale and vertical economies. Even if the hypothesis of global subadditivity is not supported, our evidence suggests that a complete divestiture policy would entail efficiency losses. *For helpful comments and discussions, we thank two anonymous referees, Graziano Abrate, Bruno Bosco, Diego Piacentino, and participants at the 31st Annual Conference of the European Association for Research in Industrial Economics (EARIE), Berlin, Germany, 2–5 September, 2004, the 60th Congress of the International Institute of Public Finance (IIPF), Milan, Italy, 23–26 August, 2004, and seminars held at the Bocconi University, University of Lecce, University of Naples, University of Pavia, and University of Turin, where earlier versions of this paper were presented. The financial support of MIUR (COFIN 2002) and HERMES Research Center is gratefully acknowledged. The usual disclaimer applies. **HERMES, Center for Research on Regulated Services, Fondazione Collegio Carlo Alberto, Via Real Collegio 30, 10024 Moncalieri (TO), Italy, http://www.hermesricerche.it.     

Unemployment and Growth in the Long Run: an Efficiency‐Wage Model With Optimal Savings*

An efficiency‐wage model of steady‐state equilibrium with labor‐augmenting technical progress is developed to explore the long‐run relationship between unemployment and growth. The rate of productivity growth is either specified exogenously or determined endogenously. In both cases, we preserve key results of the Shapiro–Stiglitz efficiency‐wage analysis without growth. Our model, however, also yields some striking new results. For instance, an exogenous increase in the growth rate may raise the rate of efficiency‐wage unemployment, and a once‐for‐all rise in the labor force may reduce the unemployment rate in the endogenous‐growth case.     

Time Past and Time Present: a Duration Analysis of IMF Program Spells*

The programs of the IMF were designed to provide short‐term assistance to countries with balance‐of‐ payments disequilibria. Over time, however, the Fund instituted new facilities with longer time horizons, while many countries adopted consecutive programs. As a result, the length of time spent by countries in IMF programs has grown. This paper analyzes IMF program spells for a group of developing economies over the period of 1982–2000. Duration models are used to investigate the time dependence of the spells and the factors that affect their duration. The hazard ratio of spells has a nonmonotonic shape, first rising and then falling. Spell duration is independent of previous spell length or the number of spells. Program duration is extended for countries with lower income, exports concentrated in primary goods, landlocked geographic status and autocratic regimes. Governments that are polarized have shorter spells, which may reflect a breakdown in governance.     

Savings growth and the path of utility

Abstract.  We derive an expression relating the change in instantaneous utility to the growth of net (genuine) saving in an economy with multiple stocks and externalities that maximizes welfare in the utilitarian sense. This result is then shown to hold for decentralized competitive efficient economies as well, to yield an extension of the Hartwick rule: instantaneous utility is non-declining along a development path if genuine saving is decreasing. By way of example the rule is applied as a constant genuine saving rate rule in a simple Dasgupta-Heal-Solow-Stiglitz economy. The rule yields a path with unbounded consumption and higher wealth than on the standard Hartwick constant consumption path.     

城镇职工基本养老保险制度财务平衡与可持续性研究

随着退休职工的不断增加,城镇职工基本养老保险基金将面临支出的压力。根据我国现行城镇职工养老保险制度的收支办法,建立养老保险基金收支预测模型,并利用安徽省的有关统计资料,对未来20年安徽省城镇职工基本养老保险基金收支进行预测。预测结果表明:从2026年起,安徽省城镇职工基本养老保险基金收支开始出现缺口,以后缺口逐年扩大。因此,应采取措施弥补基金收支的缺口。     

Alfred Marshall's Mecca: Reconciling the Theories of Value and Development*

The purpose of this paper is to explore the evolutionary nature and content of Marshall's theory of value and the relation it bears to his theory of growth and development. In Marshall's work the two theories are inextricably linked, and the subsequent attempt to separate them has not only marginalised Marshall's rich analysis but also made it impossible to appreciate the role he gave to innovation, and its corollary the growth of knowledge and organisation, in the workings of a market economy. At its core is the relation between the growth of firms and the growth of markets, but this is not steady‐state growth theory; rather, it is the different, mutually determined and ever changing growth rates of different groups of firms that is at the centre of attention. Quite how variation is linked to progress is the central topic of this essay, and the elucidation of its central role necessarily means that we must resurrect the representative firm. We conclude that Marshall was correct in stating that ‘the tendency to variation is a chief source of progress’ (Principles, V, 4, p. 355). We develop a set of evolutionary tools to show how and why this is so. But evolution is more than variation; it requires the organisation of firms and the market process to generate that correlation between differential knowledge and economic advance. Most importantly of all, the concept of a representative firm is re‐established as an indispensable element in a Marshallian evolutionary analysis.     

Marginal Tax Rates and Tax‐Favoured Pension Savings of the Self‐Employed: Evidence from Sweden*

In recent years, the study of how individuals respond to policies that aim at promoting pension savings has emerged as a vital area of economic research. This paper adds to this body of literature by estimating the tax price elasticity of contributions to tax‐favoured pension‐savings accounts on a population of self‐employed individuals. I exploit a unique total database over the Swedish population that covers the years 1999–2005. Using instrumental variables, I obtain a tax price elasticity estimate of ?0.51 and an income elasticity estimate of 0.13, whereas ordinary least‐squares (OLS) produces estimates that conflict with consumer theory.     

短期融资券与企业储蓄——融资约束诱发预防性储蓄的视角

根据企业投融资行为理论,受到融资约束的企业倾向于使用内部资金进行投资,为此需要留存利润。而短期融资券拓宽了融资渠道,有助于缓解企业融资约束,进而影响企业储蓄行为。文章利用中国A股上市公司数据,研究了短期融资券推行所引起的融资约束变化对企业储蓄的影响。实证结果表明,短期融资券的推行改变了企业的储蓄行为,使企业留存利润占净利润的比重约降低了6.8%。