A social security fallacy

The article investigates whether compulsory old age provisions are justified from an economic point of view. According to a standard argument, some people would not provide sufficiently for their old age in the absence of a compulsory pension system — they would become a charge to the public. This free rider problem can be solved by mandatory lump sum contributions. However, if contributions depend on labour income, as they do in reality, potential free riders consider them as payroll taxes — even if the pension system is fully funded and actuarially fair. Therefore, compulsory contributions which are related to earned income do not solve an economic problem which cannot be tackled by the tax system as well. Put differently, there exists no economic justification for compulsory contributions, the standard argument is simply false.     

有关社会保障的几个问题

社会保障是政府举办的，旨在向那些因遇到生、老、病、残、失业等经济事故而可能在经济上面临困难的社会成员提供的基本经济保障。它是由政府发起和实施的一种经济保障。它包含三层含义：也就是由谁来办、为谁办、怎么办的问题。     

Capital tax competition and social security

The classic capital tax policy externality is studied in the presence of a social security program where both the benefits and taxes depend on wages in an overlapping generations economy with many countries and mobile capital. We study the response and welfare implications of a coordinated capital tax rate increase across countries competing for the mobile tax base on the initial generations, the transition, and the steady state. The tax increase is initially completely capitalized, but some of the burden is shifted to labor on the transition path and in the steady state. Several new welfare effects are uncovered including an effect involving the parameters of the social security program. Sufficient conditions are provided so that all current and future generations are better off from the reform. However, social security may reduce the gain to capital tax reform.     

Limited computational ability and social security

We revisit the role of social security in countering inadequate saving for retirement. We compute the optimal social security tax rate for households who lack the computational ability to solve dynamic optimization problems. Instead, they follow the simple rule of thumb of consuming and saving a fixed fraction of disposable income. This departs from the tradition of computing the optimal tax rate when households suffer from some type of behavioral bias yet possess the ability to solve dynamic optimization problems. Our general equilibrium model is calibrated to the moments of the distribution of saving rates in the US, and our results are generally supportive of a social security program as large as the one in the US.     

Time-saving goods,time inequalities and optimal commodity taxation

International Tax and Public Finance - Time-saving goods are defined as market goods that reduce home labor requirements (e.g., restaurants; washing machines). Assuming that time savings are...     

Forecasting the size premium over different time horizons

In this paper, we provide evidence that the small stock premium is predictable both in-sample and out-of-sample through the use of a set of lagged macroeconomic variables. We find that it is possible to forecast the size premium over time horizons that range from one month to one year. We demonstrate that the predictability of the size premium allows a portfolio manager to generate an economically and statistically significant active alpha.     

Two sided efficient frontiers at multiple time horizons

Annals of Finance - Two price economy principles motivate measuring risk by the cost of acquiring the opposite of the centered or pure risk position at its upper price. Asymmetry in returns leads...     

The future of social security

We analyze the effect of the projected demographic transition on the political support for social security, and equilibrium outcomes. Embedding a probabilistic-voting setup of electoral competition in the standard OLG model with capital accumulation, we find that intergenerational transfers arise in the absence of altruism, commitment, or trigger strategies. Closed-form solutions predict population ageing to lead to higher social security tax rates, a rising share of pensions in GDP, but eventually lower social security benefits per retiree. The response of equilibrium tax rates to demographic shocks reduces old-age consumption risk. Calibrated to match features of the U.S. economy, the model suggests that, in response to the projected demographic transition, social security tax rates will gradually increase to 16%. Other policies that distort labor supply will become less important; labor supply therefore will rise, in contrast with frequently voiced fears.     

Modeling exchange rate dependence dynamics at different time horizons

Despite an extensive body of research, the best way to model the dependence of exchange rates remains an open question. In this paper we present a new approach which employs a flexible time-varying copula model. It allows the conditional correlation between exchange rates to be both time-varying and modeled independently from the marginal distributions. We introduce a dynamic specification for the correlation using the Fisher transformation. Applied to Euro/US dollar and Japanese Yen/US dollar, our results reveal a significantly time-varying correlation, dependent on the past return realizations. We find that a time-varying copula with the proposed correlation specification gives better results than alternative dynamic benchmark models. The dynamic copula model outperforms at six different time horizons, ranging from hourly to daily, confirming the model specification.     

Global demographic trends and social security reform

How sustainable are the current social security systems in the developed economies, given the projected demographic trends? The most recent literature has answered this question through dynamic general-equilibrium models in a closed-economy framework. This paper provides a new quantitative benchmark of analysis for this question represented by a two-region model (South and North) of the world economy where capital flows across regions. The timing and the extent of the demographic transition—and the associated economic forces shaping capital accumulation and equilibrium factor prices—are very different in the two regions. Thus, the projected paths of interest rate and wage rate in the North diverge substantially between closed and open economy. We perform a wide range of policy experiments under both scenarios. Our main conclusion is that if one is interested in quantifying the path of the fiscal variables (e.g., the value of the payroll tax) needed to keep the social security system viable or to finance a transition towards a fully funded system, then these two benchmarks yield similar results. However, if the focus is on quantifying the path of factor prices, aggregate variables and, ultimately, welfare, then the two approaches can diverge significantly.     

Marking the future: a review of time horizons

This paper examines the variety of time horizons used by futures researchers. It summarizes responses from a survey that asked future researches (1) how far ahead they think about the future, (2) why they choose their time intervals, and (3) the importance of being clear about time intervals for the future. Findings reveal that time horizons differ and are generally shaped by the nature of each futures researcher's work. The paper concludes with a brief discussion on the use of time horizons and importance of futures research.     

Flexible pension take-up in social security

This paper studies the redistribution and welfare effects of increasing the flexibility of individual pension take-up. We use an overlapping-generations model with Beveridgean pay-as-you-go pensions and heterogeneous individuals who differ in ability and lifespan. We find that introducing flexible pension take-up can induce a Pareto improvement when the initial pension scheme contains within-cohort redistribution and induces early retirement. Such a Pareto improving reform entails the application of uniform actuarial adjustment of pension entitlements based on average lifespan. Introducing actuarial non-neutrality that stimulates later retirement further improves such a flexibility reform.     

Gender implications of current social security reforms

This paper examines some current reforms to social security benefits / tax credits and changes to employment provisions from a gender perspective. It analyses tensions between the trend towards ‘individualisation’ and growing emphasis on the couple/household as a policy focus. New tax credits change the distribution of resources within many couples. Incentives to work for some second earners should improve; but extending in‐work subsidies to childless couples raises questions. Payment of child tax credit to the ‘main carer’ has been welcomed, though the implications of joint ownership of tax credits are unclear, and joint assessment will be extended. Many claimants' partners can now access employment services. However, this is aimed at reducing the number of workless households rather than expanding individuals' opportunities. Joint claims for jobseeker's allowance, and work‐focused interviews, involve increased responsibilities for partners but no right of access to individual income. A more consistent critical analysis of reform from a gender perspective is required.     

美国财政社会保障支出公平性分析及启示

本文以2000-2011年美国财政社会保障支出数据为基础,采用基尼系数、集中指数等分析工具对美国各州政府间财政社会保障支出的公平性、美国联邦和州政府间财政社会保障支出的合理性等问题进行了分析,最终得出了美国财政社会保障支出总体公平性较高的结论。在此基础上,对我国社会保障制度发展提出了扩大中央财政在财政社会保障支出中所占比重、合理划分各级政府的社会保障财权和事权、规范转移支付形式等建议。     

Choosing the optimal annuitization time post-retirement

In the context of decision making for retirees of a defined contribution pension scheme in the de-cumulation phase, we formulate and solve a problem of finding the optimal time of annuitization for a retiree having the possibility of choosing her own investment and consumption strategy. We formulate the problem as a combined stochastic control and optimal stopping problem. As criterion for the optimization we select a loss function that penalizes both the deviance of the running consumption rate from a desired consumption rate and the deviance of the final wealth at the time of annuitization from a desired target. We find closed-form solutions for the problem and show the existence of three possible types of solutions depending on the free parameters of the problem. In numerical applications we find the optimal wealth that triggers annuitization, compare it with the desired target and investigate its dependence on both parameters of the financial market and parameters linked to the risk attitude of the retiree. Simulations of the behaviour of the risky asset seem to show that, under typical situations, optimal annuitization should occur a few years after retirement.     

Mitigating America's demographic dilemma by pre-funding social security

Financing Social Security benefits at current levels implies significant increases in payroll taxes within the next 20 years under current US demographic developments. Using a general-equilibrium overlapping-generations model with realistic patterns of fertility and lifespan extension, this study shows that future generations would be harmed during the demographic transition due to rising payroll taxes, which crowd out savings and slow real wage growth below the rate of technological progress. A faster rate of technological progress would mitigate only some of the payroll tax increase and its economic consequences but could not overcome them. Addressing the financing problem by reducing Social Security benefits as needed or by raising the eligibility age for benefits imposes major welfare losses on current or near term retirees. By contrast, a pre-funding of Social Security financed with consumption taxes more evenly spreads the welfare losses across generations, and it helps future generations, especially the poor, by stimulating capital formation.     

Quantifying the risk-sharing welfare gains of social security

The welfare effects of intergenerational risk sharing through a pay-as-you-go social security system that is efficiently indexed to wages or interest rates are quantified. Comparing steady states, there are large welfare gains of being born into an economy with efficient risk sharing as compared to the current U.S. system. Efficient policy involves an increasingly risky net of tax income over the life cycle. When adjustment to steady state is taken into account, the welfare gains largely turn negative. The results are also compared and contrasted to the first best allocation.     

The social organization of time

If all social life has been structured around a single model of employment founded on standard working hours, the reduction in working time, and in particular the diversification of working hours, is likely to effect radical transformation from both the economic and social points of view. This diversification will continue, it is argued, because of the new economic imperatives as much as sociocultural developments. It is forecasted that the old standard model is being replaced by much more flexible management of working hours and, hence, free time. What is not so clear is whether this flexibility in working conditions, which will bring with it a revolution at the individual, company and societal levels, will be equally benign for all.     

完善社保体系已箭在弦上

完善社会保障制度对现阶段中国经济平稳运行起到极为关键的作用。社会保障制度通过对国民收入的再分配,调整国民经济运行的结构从而调节总供给与总需求的平衡,是国民经济运行可调节的"稳定器"中国经济下行趋势明显,从2010年G D P同比增长10.4%,经历四年时间下滑四个百分点至2014年的7.4%,新一代中央决策层以"新常态"定义当下的经济发展阶段,完善社会保障制度在"新常态"下更要有新作为。当前,中国已经迈入了全民保障时代。据国家有关部门的统计,2014年底,参加基本养老的人数达到8.37亿;参加城镇基本医保的人数达到