The Effects of Consumption Variability on Saving: Evidence from a Panel of Muscovite Households**

Due to the high uncertainty characterizing them, transition economies provide an extraordinary opportunity to test the precautionary saving hypothesis. This paper represents an attempt to exploit this opportunity. We use a panel of 2,346 Muscovite households, over the 12 months of 1996, to construct two time‐varying measures of consumption growth variability, which we use as proxies for households’ perceived uncertainty. We then regress household saving on these uncertainty variables using a GMM‐system estimator. We find that both uncertainty measures generally have a positive and statistically significant effect on saving. This result, which is robust to the use of different measures of saving, supports the precautionary saving hypothesis.     

应用缓冲储备模型实证检验我国居民的储蓄行为

通过应用缓冲储备模型，实证检验我国居民的教育、医疗、住房等开支的不确定性与储蓄之间的相关性，我们发现，我国居民的预防性储蓄行为不仅显著，而且以目标储蓄率为被解释变量的模型，能够比以储蓄水平为被解释变量的模型更好地解释我国居民的“预防性储蓄”动机。建立完善的医疗保障体系、改革教育体制是降低我国巨额储蓄的必经之路。     

Life‐Cycle Consumption and Children: Evidence from a Structural Estimation

I estimate by maximum likelihood a dynamic model of optimal intertemporal allocation of consumption in the presence of children using high‐quality Danish longitudinal data. The number and age of all children can affect the marginal utility of consumption while income uncertainty, credit constraints and postretirement motives also influence household behaviour. While I estimate that children have a surprisingly small effect on the marginal utility of non‐durable consumption, data simulated from the estimated model replicates similar correlations between log consumption growth and changing household composition as found in the Danish data and typically found in UK and US data. To reconcile the results with existing studies, I illustrate how ignoring precautionary motives increases the estimated importance of children. The results indicate that precautionary motives might play a larger role than children in explaining the observed consumption age profile.     

Looking for a Guide to Protect the Environment: The Development of the Precautionary Principle

Abstract.  If the precautionary principle is to become the guide of the international community for environmental protection policies, an economic interpretation of the principle is in order. The analysis of case studies and a survey of the recent decision theoretic literature show the lack of a fully satisfactory economic model. More generally various theoretical and empirical results show that the principle cannot be assumed to apply a priori . Though it has been proposed by international treaties as a rule of thumb for situations of scientific uncertainty, the precautionary principle could actually be inefficient.     

增补预防性储蓄的托宾-索洛模型

非预期的预防性储蓄通过资产替代产生稳态名义货币增长率(或稳态通货膨胀率)对稳态人均资本(或稳态人均产出)的非线性门槛效应。门槛的临界值是非预期预防性储蓄与实际货币增加量比率的递减函数。非线性机制取决于非预期预防性储蓄与实际货币增加量比率和人均实际货币余额-人均资本比率与通货膨胀率、人均资本边际产出的相关性。     

Investment and Uncertainty: A Theory‐based Empirical Approach*

This paper provides empirical evidence on the dynamic effects of uncertainty on firm‐level capital accumulation. A novelty in this paper is that the firm‐level uncertainty indicator is motivated and derived from a theoretical model, the neoclassical investment model with time to build. This model also serves as the base for the empirical work, where an error‐correction approach is employed. I find a negative effect of uncertainty on capital accumulation, both in the short run and the long run. This outcome cannot be explained by the model alone. Instead, the results suggest that the predominant mechanism at work stems from irreversibility constraints.     

Precautionary motives and portfolio decisions

This paper studies the empirical relevance of precautionary and other motives for household portfolio behaviour using recent panel data from the Netherlands. Dutch households' portfolios exhibit low degrees of risk taking and diversification. It is possible that this is the outcome of a rational, precautionary response to unavoidable exposure to background risk (stemming from the labour market or health conditions, etc.). We consider as alternative explanations liquidity needs and habits. The endogenous variable is the fraction of clearly safe in total financial assets at the household level. Parametric and semi‐parametric censored regression models for pooled cross‐sections and random and fixed effects models for panel data show that both heteroscedasticity and unobserved heterogeneity are of major importance in the data. With subjective indicators of income uncertainty we find a limited role for precautionary motives. Copyright © 2002 John Wiley & Sons, Ltd.     

Saving motives and multivariate precautionary premia

This paper extends the concept of precautionary premium to a multivariate setting so as to measure the intensity of the precautionary saving motive to protect against multivariate risks. This makes it possible to disentangle and to link the various motives of precautionary saving depending on the configuration of the risks the individual wants to protect against.     

Health insurance and savings over the life cycle—a semiparametric smooth coefficient estimation

Individuals save for future uncertain health care expenses. This is less efficient than pooling health risk through insurance. The provision of comprehensive health insurance may raise welfare by providing the missing market to smooth out consumption through the life cycle. We employ a semiparametric smooth coefficient model to examine the effects of the introduction of the National Health Insurance in Taiwan in 1995 on savings and consumption over the life cycle. The idea is to estimate the coefficients of health insurance which vary with age. Our results suggest that younger households are more sensitive to the risk reductions, and that they demonstrate a greater response in the reduction of their precautionary saving. Copyright © 2004 John Wiley & Sons, Ltd.     

Price uncertainty, saving, and welfare

We analyze how commodity price uncertainty affects saving behavior and welfare in a dynamic model with multiple commodities, portfolio hedging, and a preference structure that disentangles ordinal preferences, attitudes towards risk, and attitudes towards intertemporal substitution. We show that the effect of price uncertainty on savings boils down to knowing (1) hf degree of resistance to intertemporal substitution and (2) the effect that uncertainty has on the certainty-equivalent real interest rate. We also show that, if the certainty-equivalent real interest rate is lower with uncertainty, consumers' welfare is also lower.     

Prudence and precautionary saving

Households save income for various reasons, including the need to plan for the future, the intention to leave a bequest, and the desire to guard against unforeseen expenditures and income fluctuations. Although it is widely believed that prudent individuals engage in precautionary saving, the extent of such saving is not well understood. This paper develops a model of saving with an explicit role for the Leland-Kimball measure of prudence. Estimation of the model using household-level data from Italy suggests an average value of relative prudence near 4 or 5, with approximately 15 to 36 percent of total saving being precautionary. The authors are grateful to an anonymous referee for helpful comments.     

Testing the Empirical Relevance of the ‘Saving for a Rainy Day’ Hypothesis in US Metro Areas

The joint implication of the consumption Euler equation and cointegration between income and consumption is that savings predict future income declines, the ‘saving for a rainy day’ hypothesis. The empirical relevance of this hypothesis plays a key role in discussions of fiscal policy multipliers, and it holds under the null that the permanent income hypothesis is true. We find little support for this hypothesis using time series data for the 100 largest US Metropolitan Statistical Areas for the period 1980q1–2015q4. Our approach is to test for cointegration and weak exogeneity between income and consumption, and by exploring the direction of Granger causality between the two time series. We find that income more often predicts consumption and saving than the converse. We also give evidence that house price changes played a role in US income and consumption dynamics, before, during and after the Great Recession.     

Housing Wealth and UK Consumption

There is widespread disagreement about the role of housing wealth in explaining consumption. However, much of the empirical literature is marred by poor controls for the common drivers both of house prices and consumption, such as income, income growth expectations, interest rates, credit supply conditions, other assets and indicators of income uncertainty (e.g. changes in the unemployment rate). For instance, while the easing of credit supply conditions is usually followed by a house price boom, failure to control for the direct effect of credit liberalisation on consumption can over‐estimate the effect of housing wealth or collateral on consumption. This paper (Janine Aron, John Muellbauer and Anthony Murphyi, October 2006) estimates an empirical model for UK consumption from 1972 to 2005, grounded in theory, and with more complete empirical controls than hitherto used.     

What went wrong with the Hungarian consumption function? An econometric investigation of the time series aggregate consumption function for Hungary for 1960–1989

The paper focuses on the time series aggregate consumption function for the Hungarian economy. The empirical econometric analysis presented produces several new results. First, it shows that the income and consumption variables used in this type of model by previous studies are I(2) variables. Consequently, error correction models formulated in terms of their first differences are mis-specified. Second, it provides a strong empirical evidence supporting the view that consumption (and thus saving) was (real) interest rate elastic during the period under investigation, having impact both on the long run and on the short relationships between income and consumption. Third, it provides empirical evidence on choosing the proper income variable in the consumption function. The model selection results clearly supports the model with unadjusted total real money income variable. Fourth, it shows that for the period 1960–1986 a correctly specified and stable error correction model can be established. Finally, the analysis shows that when used for the period beyond 1986, this model suffers from a structural break.     

Precautionary behavior and consumer information: A Markov process approach

This paper explores the role of consumer confidence in the equilibrium of a dynamic macroeconomic growth model with rational expectations. Consumers face an uncertain future income stream due to a Markov stochastic process that affects production. Changes in the properties of this process change consumer information sets and optimal policies in the rational expectations format. Increases in “persistence” in the shock process are considered; this is identified with the consumer's subjective assessment of future economic conditions. Two cases are considered: where either good or bad states of the process are more likely to persist into the future, and where bad states persist unconditionally at the expense of good. Consistent with earlier treatments of savings under uncertainty (Barsky, Mankiw and Zeldes 1986, and Skinner 1988), the consumer's response to increased income uncertainty is to exhibit precautionary saving behavior. The infinite-horizon growth model format used offers significant improvement over other finite-horizon life cycle models. Specifically, the model is a full general equilibrium model and the solutions are rational expectations solutions. The technique also is easily adapted to other recursive decision problems under uncertainty.     

Life-cycle hypothesis, propensities to save, and demand for financial assets

In recent decades, the United States has not only experienced great economic changes in the financial markets but also undergone tremendous social and demographic transformations. Based on the life-cycle theory of consumption and saving, Keynes’s concept of marginal propensity to save, and Friedman’s theory of asset demand, this study shows that changes in sociodemographic conditions have significant impacts on the saving behavior of individuals in the financial markets. Findings indicate that the amounts of savings held in financial institutions for transactions, precautionary, and speculative motives differ substantially among individuals with divergent socio-economic characteristics. Regression results also show that individuals with different demographic backgrounds differ greatly in their propensities to save and hold financial assest with different degrees of liquidity and risk. The author is grateful to an anonymous referee for many valuable comments and to Thomas Palumbo, Michael Davern, Stephanie Shipp, and Arthur Kennickell for their suggestions. This paper reports the results of research and analysis undertaken by Census Bureau staff. It has undergone a more limited review than offical Census Bureau publications. This report is released to inform interested parties of research and to encourage discussion.     

10KV配电网节能降耗措施研究

配电网是电力系统中功率消耗的主要部分,实现10kV配电网的节能降耗具有重要意义。10kV配电网的节能降耗包括变压器降耗和线路降耗两部分。变压器降耗可以通过保障变压器经济运行、推广节能变压器和进行无功补偿等方法解决。降低线路损耗可以通过提高线路截面积、缩短传输距离和降低三相不平衡度来解决。     

Precautionary and Entrepreneurial Savings: New Evidence from German Households*

Various studies interpret the positive correlation between income risk and wealth as evidence of significant precautionary savings. However, these high estimates emerge from pooling non‐entrepreneurs and entrepreneurs, without controlling for heterogeneity. This article provides evidence for Germany based on representative panel data that includes private wealth balance sheets. Entrepreneurs, who face high income risk, hold more wealth than employees, but this tendency is not because of precautionary motives. Instead, they appear to save more for their old age, because they are usually not covered by statutory pension insurance. The analysis accounts for endogeneity in entrepreneurial choice and heterogeneous risk attitudes.     

江苏后发达地区农村消费者行为特征分析及对策

近年来,江苏农村人口一直占50%左右。在收入低约束下,伴随着流动性约束以及未来收入和支出不确定性的影响,农村居民的消费倾向较低,消费结构也不够合理。本文在分析国内外学者对农村消费者的消费结构研究基础上,利用斯通的线性支出系统模型,对江苏省后发达地区农村消费者的行为进行实证研究,指出该群消费者现有的消费行为特点及存在的问题,并从政府和企业的角度提出了相应的对策。     

A political economy model of road pricing

In this paper, we use a simple majority voting model to study the introduction of urban congestion tolls. The model allows for different types of uncertainty and considers different uses of the toll revenues. The following results are obtained. First, we show that individual uncertainty with respect to modal substitution costs may imply that a majority votes against road pricing ex ante, although a majority would have been in favor after its introduction ex post. Moreover, if a majority is against road pricing ex ante, there will also be no majority for organizing an experiment that would take away the individual uncertainty. Second, political uncertainty with respect to the use of the revenues corroborates the finding that ex ante more voters will be against the introduction of tolls. Third, both types of uncertainty suggest that fewer voters are against road pricing when toll revenues are used to subsidize public transport than when they are redistributed to all voters. Importantly, the results of this paper are consistent with a number of recent empirical observations on efforts to introduce road pricing, including the systematic rejection of road pricing in referenda, the more favorable attitudes towards road pricing after than before its introduction, and tying the toll revenues to support public transport.