ACCOUNTING FOR THE TIMING OF FIRST MARRIAGE*

Among first marriages in the United States, grooms are on average 1.7 years older than their brides. Traditionally, this fact is explained by sex differences in income. We use a general equilibrium, overlapping generations search model economy to show instead that sex differences in fecundity are essential to account for the age gap at first marriage, whereas sex differences in income play a secondary role. Our model economy also accounts for other facts on the timing of first marriages that the literature has overlooked.     

THE TIMING OF UPGRADES*

By using a durable‐goods monopolist model, this paper investigates the timing of upgrades. I consider a three‐period model where the monopolist can upgrade the product in the second and third periods by investing in R&D. I analyse the non‐commitment and commitment cases. In the latter case, the decision on the timing of upgrades is made in the first period in advance. It is shown that the time‐inconsistency problem causes the monopolist in the non‐commitment case to release a new version more rapidly than in the commitment case. Moreover, even in the non‐commitment case, the release of a new version can still be later than the optimum from the social viewpoint.     

THE EFFECTS OF ABANDONMENT OPTIONS ON INVESTMENT TIMING AND INTENSITY

This paper examines how the presence of an abandonment option affects the timing and intensity of a firm’s investment. We develop a continuous‐time model wherein a firm is endowed with a perpetual option to invest in a project at any time by incurring an investment cost at that instant. The amount of the investment cost is directly related to the intensity of investment that is endogenously chosen by the firm at the investment instant. The project generates a stream of stochastic revenue flows with a concomitant stream of constant cost flows, both of which increase with the investment intensity. We show that allowing the firm to make an irreversible decision to abandon the project does not affect the firm’s optimal investment intensity if the investment cost is totally reversible. Otherwise, the option to abandon the project induces the firm to choose a lower level of investment intensity. Furthermore, we show that the presence of the abandonment option pushes down the firm’s optimal investment trigger, thereby hastening the undertaking of the project.     

ON THE EMERGENCE OF NON‐PROFIT FIRMS AS ALTERNATIVES TO THE GOVERNMENT*

It is well known that many non‐profit firms coexist with government firms in industries that provide collectively consumed goods and services, such as education, healthcare, social services, and art and culture. This paper explores the specific circumstances under which non‐profit firms can emerge as alternatives to the government. We show that a non‐profit firm emerges only when the residents’ median preference for a collective good is significantly low. This finding implies that, somewhat paradoxically, a non‐profit firm emerges to replace the government and provide a collective good only when the majority of residents consider the good non‐essential.     

UNCERTAIN INCOME,UNCERTAIN TAXES AND RICARDIAN EQUIVALENCE*

L. K. C. Chan (1983) and R. B. Barsky et al. (1986) have demonstrated that a tax cut financed by bonds to be repaid from proportional income taxes on uncertain future income, by reducing the latter's riskiness, stimulates current consumption - Ricardian equivalence does not hold. However, their two-period models exclude the possibility that future taxes are uncertain. In this paper a three-period model is developed that, by allowing the government two periods in which to collect taxes, introduces ex ante tax rate uncertainty. This renders the result concerning Ricardian equivalence ambiguous. By comparison, taxes levied as lump sums and via a ‘lottery’ respectively produce the ‘usual’ effects (zero and negative) on consumption.     

INFLUENCES ON THE TIMING OF FIRST CHILDBEARING

This paper presents evidence that women from different population subgroups respond differently to economic and background influences when timing initial childbearing. Among all groups examined, age at first birth tends to increase as education levels increase, and married women with spouses present tend to be older than other women at first childbirth. Among whites, all economic influences considered–hourly pay rate, nonmarket income, and work during the year prior to childbearing–have a significant influence in deferring first childbirth, but family background does not. Among blacks, family background plays a significant role in determining age at first childbirth, but only one economic influence–the hourly pay rate–is significant. Blacks' response to family background is somewhat greater than their response to hourly pay rate. Race as a separate influence is significant among women age 20 years or under, but that influence disappears among older women. Because of their adverse economic consequences, adolescent pregnancies and unwed motherhood are of mounting concern. This study suggests that, contrary to popular belief, welfare programs do not foster early pregnancy nor do programs to reduce unemployment deter it. Educational achievement, however, serves as a deterrent to early pregnancy among all groups.     

PRIVATISATION AND TIMING IN A MIXED OLIGOPOLY WITH BOTH FOREIGN AND DOMESTIC FIRMS*

This paper models a mixed oligopoly with both a domestic and a foreign private firm and examines the resulting timing in the quantity setting game. We demonstrate that with a single simultaneous pre‐game delay stage, the resulting endogenous timing has either the public firm leading or the two private firms leading. An alternative characterisation of the pre‐game stage results in the single timing in which the two private firms lead and the public firm follows. For all timings that emerge endogenously, we show that privatisation will always lower domestic welfare but its influence on global welfare is ambiguous.     

THE EFFECT OF HUSBAND'S JOB DISPLACEMENT ON THE TIMING AND SPACING OF BIRTHS IN THE UNITED STATES

I use husband's job displacement as an exogenous shock to identify the effect of income on the timing and spacing of births. Gradual adjustment of fertility to income shock is considered in life‐cycle model with uncertainty. Flexible hazard model, estimated jointly for the first three births, allows household's fertility to be affected not only in the period of displacement but also before and after. General displacements and layoffs have negative log‐run effect on the timing and spacing of only the first and the third births. The effect persists with nonparametric controls for woman‐ and transition‐specific heterogeneity, and after robustness checks. (JEL J13, J63, C41)     

ON THE TIMING OF PRODUCTION DECISIONS IN MONETARY ECONOMIES

In most macroeconomic models inflation tends to be harmful. In this article, we show that by simply changing the timing of production decisions by firms from “on demand” to “in advance,” some inflation can boost welfare as long as goods are sufficiently perishable. The main conclusion from this research is that by effectively hiding the strategic interaction between supply and demand, assuming production on demand is not without loss of generality.     

THE WELFARE EFFECTS OF PAY-AS-YOU-GO RETIREMENT PROGRAMS: THE ROLE OF TAX AND BENEFIT TIMING

It is well known that pay-as-you-go retirement programs reduce steady-state welfare and the capital stock in dynamically efficient overlapping generation (OLG) economies. The common two-period OLG model obscures, however, the relationship between the magnitude of these effects and the ages at which taxes are paid and benefits received. Program changes that shift taxes to older workers or benefits to younger retirees have effects similar to reductions in program size, yielding steady-state welfare gains and increases in capital accumulation while imposing transition costs on current generations. This analysis has policy implications for both tax and benefit timing . ( JEL H55, E62)     

人口老龄化对中国经济的 持久性影响及其对策建议

基于人口普查和联合国的人口预测,本文分析了人口老龄化对劳动力供给、资本积累、支柱产业和技术进步等方面的不利影响。应对快速人口老龄化,必须树立科学人口发展观,分阶段放开一胎化生育政策,循序提高退休和领取养老保险年龄,同时制定与实施和人口结构变化相适应的产业规划,发展老龄产业,调整产业结构。     

CHANGING PENSION POLICY AND THE AGING OF AMERICA

The recently enacted Tax Reform Act of 1986 contains a number of pension policy provisions including faster vesting for private-sector, single-employer pension plans and imposing tax penalties on preretirement pension plan distributions that are not saved until retirement age. Since pensions are a long-term commitment, the impact of pension policy changes may not be fully realized for a number of years. For that reason, the effects of the Tax Reform Act's pension provisions are investigated using both short-run and long-run simulation models. Faster vesting would immediately entitle an additional 1.9 million pension plan participants to pension benefits at retirement. This increase would not, however, be translated directly into significant gains in pension recipiency for workers currently in their 50s. Nevertheless, by the time the baby boom generation retires, faster vesting and lump-sum penalties could provide more retirees with pensions and increase the standard of living of pension recipients.     

ON THE SELF-ORGANIZATION AND EVOLUTION OF ECONOMIC GEOGRAPHY*

Focusing on the topics of the self-organization and evolution of spatial economies, this paper presents a highly selective review of recent development in economic geography. It is shown, in particular, that dynamical approaches based on monopolistic competition models are useful for the study of the long-run evolutionary processes of spatial economies dominated by cities. The relationship between spatial agglomeration and economic growth is also discussed.     

中部崛起与湖南的机遇和挑战

回顾了＂中部崛起＂论提出的背景,结合湖南经济发展实际,分析了其在中部崛起中将获得的机遇以及面临的挑战和压力.并针对省情提出了应对措施.     

ANARCHY, UNCERTAINTY, AND THE EMERGENCE OF PROPERTY RIGHTS

This paper investigates whether Lockean first claimer property rights should be expected to emerge in anarchy. Individuals behind a veil of uncertainty about their future wealth decide independently whether to commit to using fcrce. Neither the contractarian hypothesis that a thicker veil of uncertainty supports more co-operation nor Demsetz's hypothesis that well-defined property rights emerge as the value of the externality from not having private property increases is unambiguously implied by the model.     

THE ROLE OF LABOR AND MARRIAGE MARKETS,PREFERENCE HETEROGENEITY,AND THE WELFARE SYSTEM IN THE LIFE CYCLE DECISIONS OF BLACK,HISPANIC, AND WHITE WOMEN*

Using data from the NLSY79, we structurally estimate a dynamic model of the life cycle decisions of young women. The women make sequential joint decisions about school attendance, work, marriage, fertility, and welfare participation. We use the model to perform counterfactual simulations designed to shed light on three questions: (1) How much of observed minority–majority differences in behavior can be attributed to differences in labor market opportunities, marriage market opportunities, and preference heterogeneity? (2) How does the welfare system interact with these factors to augment those differences? (3) How can new cohorts that grow up under the new welfare system (Temporary Aid for Needy Families) be expected to behave compared to older cohorts?