New Releases by Laurence J. KOTLIKOFF

Many undergraduate texts treat macroeconomics as a set of distinct topics rather than as a unified body of theory and empirical findings. In contrast, this text by Alan Auerbach and Laurence Kotlikoff uses a single analytic framework—the two-period life-cycle model—to explore and connect each of the major issues in contemporary macroeconomics. The model describes the evolution of the economy over time in terms of the behavior of overlapping generations of individuals, each of whom lives for two periods: youth and old age. This versatile framework can encompass most macroeconomic schools of thought through the alteration of key assumptions. The use of one basic model also allows the authors to explore important topics not always addressed adequately in other texts; these include credit constraints, real business cycles, generational accounting, and international capital flows markets. Written in a clear, accessible style, this shortened and simplified second edition provides a systematic way to interpret macroeconomic outcomes, to understand various policy proposals, and to appreciate how individuals and firms fit into the big picture.

This paper compares two general methods of privatization social security: forced participation in the new privatized system vs. letting people choose between the new system or staying in social security (i.e., opting out). Simulations are performed using a large scale perfect-foresight OLG simulation model that incorporates both intra-generational and inter-generational heterogeneity. The decision of any agent to opt out is endogenous and depends on the opting out decisions of all other agents vis- ...-vis factor prices. Various tax bases are considered in financing the transition path, as well as the perceived tax-benefit linkage due to the informational problems inherent in many social security systems. We consider two cases: full and no perception Both methods of privatizing social security lead to large long- run gains for all lifetime income classes despite the intra-generational progressivity of social security, but differ in their short run effects due to adverse selection associated with opting out. Adverse selection is a key reason why many economists oppose opting out and why many plans to privatize social security systems mandate participation. This paper, however, shows this wisdom to be wide of the mark. Opting out is better at protecting the welfare of the initial elderly, even though forced participation protects their real value of social security benefits because opting out continues to collect payroll tax revenue from those who stay with social security. Opting out can mean quicker transition paths by reducing social security wealth faster than forced participation, because many will forfeit their accrued claims as the price of opting out. Yet opting out, along with a decrease in the payroll tax rate is better at shifting the burden to future workers who benefit from privatization.

Almost two decades have passed since the development of the prototype of the Auerbach-Kotlikoff dynamic life-cycle simulation model. The model has been used to examine a host of policies, including tax reform, tax cuts, investment incentives, tax progressivity, expansion of social security, government spending, monetary policy, endogenous growth, the size of the informal sector, human capital accumulation, and educational policy. It has also been used to study demographic change, the timing of policy impacts, the efficiency gains from fiscal reforms, and the effects of fiscal policies on both the intra- and intergenerational distributions of economic welfare. Auerbach and Kotlikoff and their co-authors have done much of this research. The rest has been done by other economists in academia, government, and multilateral lending institutions, many of whom have developed their own versions of the model. This paper describes the origins of the A-K Model, its current structure, the lessons learned using it, and some of the questions that remain to be addressed. It also considers two issues -- tax reform and social security privatization -- in illustrating the model''s current capacities

Since 1980, the U.S. net national saving rate has averaged less than half the rate observed in the 1950s and 60s. This paper develops a unique cohort data set to study the decline in U.S. national saving. It decomposes postwar changes in U.S. saving into those due to changes in cohort-specific consumption propensities, those due to changes in the intergenerational distribution of resources, those due to changes in government spending on goods and services, and those due to changes in demographics. Our findings are striking. The decline in U.S. saving can be traced to two factors: The redistribution of resources from young and unborn generations with low or zero propensities to consume toward older generations with high consumption propensities, and a significant increase in the consumption propensities of older Americans. Most of the redistribution to the elderly reflects the growth in Social Security, Medicare, and Medicaid benefits. The increase in the elderly''s consumption propensities may also reflect government policy, namely the fact that Social Security, Medicare, and Medicaid benefits are paid in the form of annuities and that, in the case of Medicare and Medicaid, the annuities are in-kind and must, therefore, be consumed.

We use the 1988 PSID to study the effects of income and wealth on transfers of money and time between individuals and their parents as well as the effects of incomes of other relatives on these flows. We relate the relative incomes of parents and parents in-law to transfer amounts given and received by married couples. We also study how the relative incomes of divorced parents influence transfers. We find that money transfers tend to reduce inequality in household incomes and that time transfers are only weakly related to income differences. Richer siblings give more to parents and receive less. Among parents and parents in-law the richer set of parents is more likely to give money and less likely to receive money. The same is true of divorced parents. In contrast to the implications of simple exchange models of transfers, there is little evidence in the cross section or in the analysis using siblings that parental income or wealth raises time transfers from children or that time transfers are exchanged for money transfers. In the cross section and among siblings, the strong negative relationship between time transfers and distance from parents is not associated with a strong negative relationship between distance and money transfers. We discuss the implications of our results for alternative models of transfers.

This paper studies the macroeconomic and efficiency effects of privatizing social security. It does so by simulating alternative privatization schemes using the Auerbach-Kotlikoff Dynamic Life-Cycle Model. The simulations indicate three things. First, privatizing social security can generate very major long-run increases in output and living standards. Second the long-run gains from privatization are larger if privatization redistributes resources from initial to future generations, the pure efficiency gains from privatization are also substantial. Efficiency gains refers to the welfare improvement available to future generations after existing generations have been fully compensated for their losses from privatization. The precise size of the efficiency gain depends on the existing tax structure, the linkage between benefits and taxes under the existing social security system, and the method chosen to finance benefits during the transition. Third, at least in the long run, privatizing social security is likely to be progressive in that it improves the well-being of the lifetime poor relative to that of the lifetime rich.

Written in a clear, accessible style, this shortened and simplified second edition provides a systematic way to interpret macroeconomic outcomes, to understand various policy proposals, and to appreciate how individuals and firms fit into the big picture.

In an effort to bring all generations to an understanding of the American economy, Laurence Kotlikoff shares information of the budget deficit of the United States government. Generational Accounting strives to educate readers on how the economy of the United States American functions, from explaining who pays for the goods and services the nation receives to when it must be paid, and just how much money goes to it. Kotlikoff analyzes how the government’s budget deficit is the cornerstone of conventional economic policy and argues that it is a number devoid of economic content, often used to lead the American people astray. “Read it and you’ll be on the cutting edge of future debates on fiscal policy.” – Fortune

Examines evidence which points to a deterioration in the standard of living of American children relative to adults, particularly the current elderly. With generational accounting, it compares the lifetime net tax burdens (taxes paid less transfers received) of different generations.

We consider four models of consumption that differ with respect to efficient risk-sharing and altruism. They range from complete markets with altruism to family risk-sharing. We use a matched sample of parents and independent children available from the Panel Study of Income Dynamics to discriminate between the four models. Our testing procedure is designed to deal with the set of observed independent children being endogenously selected. The combined hypothesis of complete markets and altruism can be decisively rejected, while we fail to reject altruism and hence family risk-sharing for a subset of families.

Locational choice is one of the fundamental exercises of consumer sovereignty. When regions (or localities within regions) specify different tax rates or supply different amounts of public goods, they distort individuals'' location choices. This paper models and measures for the U.S. and New England the location distortion arising from inter regional differences in taxation and supplies of public goods. In our overlapping generations model agents, at each point in their lifespan, choose where to locate taking into account their locational preferences, each region''s wage, consumption, and personal capital income taxes, and each region''s supply of public goods. The findings suggest that regional fiscal differences play an important role in the location choices of three to four percent of Americans. For these Americans the distortion of location choice is equivalent to roughly a half of a percent of their lifetime consumption. Across all Americans, however, the location distortion induced by U.S. regional fiscal differences is quite small, simply because the differences in tax rates and per capita levels of public goods expenditures across regions are not sufficiently large to induce most Americans to change location. Our analysis indicates, however, that location distortions are an increasing function of regional differences in tax rates and levels of public goods expenditure. Indeed, a doubling of the scale of public finances across all U.S. states would lead to roughly a quadrupling of the location distortion.

Our previous study (Auerbach, Gokhale and Kotlikoff 1991) introduced the concept of generational accounting, a method of determining how the burden of fiscal policy falls on different generations. it found that fiscal policy in the U.S. is out of balance, in terms of projected generational burdens. This means that either current generations will bear a larger share (than we project under current law) of the burden of the government''s spending or that future generations will have to pay, on average, at least 21 percent more, on a growth-adjusted basis, than will those generations who have just been born. These conclusions were based on relatively optimistic assumptions about the path of social security sod Medicare policies, namely that the accumulation of a social security trust fund would continue and that Medicare costs would not rise as a share of QP. In this paper, we simulate the effects of realistic alternative paths for social security and Medicare. Our results suggest that such alternative policies could greatly increase the imbalance in generational policy, making not only future generations pay significantly more, but current young Americans as well. For example, continued expansion of Medicare in this decade alone could double the 21 percent imbalance figure if the bill for this Medicare growth is shifted primarily to future generations.

This paper compares the predictions of three different saving models with respect to the impact of projected U.S. demographic change on future U.S. saving rates. The three models are the life cycle model, the infinite horizon altruism model, and a reduced form econometric model. The findings for the different models indicate a great range of possible paths of future U.S. saving. However, the three models concur in predicting a peak in the U.S. national saving rate in the near future (within 15 years), followed by a significant decline in the saving rate thereafter. In fact, the findings suggest the strong possibility of negative U.S. saving rates beginning after 2030.

This paper examines whether middle age American households purchase adequate amounts of life insurance. The analysis is based on SRI International''s 1980, 1982, and 1984 surveys of the financial positions of American households. Our findings indicate that a significant minority of American wives are highly under-insured with respect to the possible deaths of their husbands. Under the assumption that actuarially fair annuities are available we find that just over 30 percent of wives are inadequately insured, by which we mean they would suffer a loss in their rate of sustainable consumption of at least 30 percent in the event of being widowed. If one assumes that annuities are not available the fraction of wives who are inadequately insured is 24 percent. These findings on inadequate life insurance are even more striking if one focuses on those households in which over half of the couple''s present expected value of resources is dependent on the husband''s survival. The fraction of wives in such households who are inadequately insured is 41 percent if one assumes fair annuities are available, and 31 percent if one assumes annuities are unavailable. The problem of inadequate insurance is even more significant among households of more modest means. Almost half of wives in such households who are in need of life insurance protection are inadequately insured, and this statement holds regardless of whether fair annuities are available. The results of this paper together with those of the related literature strongly suggest that raising the share of social security benefits that are paid to surviving spouses as well as increasing in employer-provided group life insurance could have a very considerable impact on the alleviation of poverty among widows, especially elderly widows.

What is the basic economic decision-making unit? Is it the household or the extended family? This question is fundamental to economic analysis and policy design. The answer given by the Life Cycle and Keynesian models is that the economic unit is the household. According to these models, members of particular households act selfishly and do not fully share resources with extended family members in other households. Hence, altering the distribution of resources across households within the extended family will alter the consumption and labor supply of those households who acquire or lose resources. In contrast to the Life Cycle and Keynesian models, the altruism model implies that the extended family is the basic economic decision-making unit. According to this model the extended family is linked through altruism and, as a result, acts as if it fully shares resources. In the altruism model nondistortionary changes in the distribution of resources across households within the extended family will have no effect on the consumption or labor supply of any of its members. Despite its importance, the boundaries of economic decision-making units have not, to our knowledge, been examined directly with micro data. Stated differently, the altruism model has not been tested against the Life Cycle and Keynesian alternatives with such data. This paper uses matched data on parents and their adult children, contained in the Panel Study of Income Dynamics, to perform such a test. In essence our test asks whether the distribution of consumption and labor supply across households within the extended family depends on the distribution of resources across households within the extended family. Our findings provide quite strong evidence against the altruism model. The distribution of resources across households within the extended family is a highly significant (statistically and economically) determinant of the distribution of onsumption within the extended family. This finding holds for the entire sample as well as the subsample consisting of rich parents and poor children. In addition to showing that the distribution of extended family resources matters for extended family consumption, we test the life cycle model by asking whether only own resources matter, i.e., whether the resources of extended family members have no affect on a household''s consumption. Our results indicate that extended family member resources have, at most, a modest effect on household consumption after one has controlled for the fact that extended family resources help predict a household''s own permanent income.

Notwithstanding its widespread use as a measure of fiscal policy, the government deficit is not a well-defined concept from the perspective of neoclassical macro economics. From the neoclassical perspective the deficit is an arbitrary accounting construct whose value depends on how the government chooses to label its receipts and payments. This paper demonstrates the arbitrary nature of government deficits. The argument that the deficit is not well-defined is first framed in a simple certainty model with nondistortionary policies, and then in settings with uncertain policy, distortionary policy, and liquidity constraints. As an alternative to economically arbitrary deficits, the paper indicates that the "Fiscal Balance Rule" is one norm for measuring whether current policy will place a larger or smaller burden on future generations than it does on current generations. The Fiscal Balance Rule is based on the economy''s intertemporal budget constraint and appears to underlie actual attempts to run tight fiscal policy. It says take in net present value from each new young generation an amount equal to the flow of government consumption less interest on the difference between a) the value of the economy''s capital stock and b) the present value difference between the future consumption and future labor earnings of existing older generations. While the rule is a mouth-full, one can use existing data to check whether it is being obeyed and, therefore, whether future generations are likely to be treated better or worse than current generations

In recent years the role of intergenerational transfers in the process of wealth accumulation has been the subject of substantial empirical and theoretical analysis. The key question stimulating this research is what is the main explanation for savings? Is it primarily accumulation for retirement as claimed by Albert Ando, Richard Brumberg, and Franco Modigliani in their celebrated Life Cycle Model of Savings? Is it primarily intentional accumulation for intergenerational transfers? Or is it primarily precautionary savings, much of which may be bequeathed because of imperfections in annuity markets? This paper examines a range of findings on the importance of intergenerational transfers. The strong conclusion that emerges from this evidence is that intergenerational transfers play a very important, if not a key, role in aggregate wealth accumulation. While intergenerational transfers figure very large in savings, the precise motivation for such transfers is unclear. Intergenerational altruism might appear the most likely candidate, but at least sane stylized facts, such as the equal allocation of bequests among children, are strongly at adds with the altruism model. Other explanations involving imperfect insurance arrangements or payments for child services do not appear capable of explaining the substantial amounts of transfers actually observed. Sorting cut the relative contributions of different models to intergenerational transfers and the precise role of intergenerational transfers in the process of wealth accumulation remains an intriguing and exciting enterprise

Perhaps no single statistic raises more concern about post War changes in the U.S. family than the proportion of the elderly living alone. Since 1940 the proportion of elderly living alone and in institutions has risen dramatically. While demographics appear to explain much of the change in the living arrangements of the elderly, the rising income of the elderly is viewed by many as the chief or at least a chief reason why the elderly live alone. The analyses underlying this view have not, however, considered the incomes and preferences of the children of the elderly. This paper presents a model of the joint living arrangement choice of parents and children. It then uses a new set of data to consider how the preferences and income positions of the elderly and their children influence the living arrangements of elderly parents. The findings suggest that the preferences and income levels of children may be important factors in explaining why so many of the elderly live alone.

This year marks the twenty-fifth anniversary of Arnold Harberger''s celebrated model of the corporation income tax. While the model has been enormously useful as an analytical device for studying two sector economies, its usefulness for understanding the incidence and excess burden of the corporate income tax remains in question. One difficulty confronting all empirical analyses of the Harberger Model is how to treat noncorporate production in primarily corporate sectors and corporate production in primarily noncorporate sectors. The Harberger Model provides no real guide to this question since it assumes that one good is produced only by corporations and the other good is produced only by noncorporate firms. Stated differently, Harberger models the differential taxation of capital used in the production of different goods, rather than the taxation of capital used by corporations per se. This paper presents a two good model with corporate and noncorporate production of both goods. The incidence of the corporate tax in our Mutual Production Model (MPM) can differ markedly from that in the Harberger model. A hallmark of Harberger''s corporate tax incidence formula is its dependence on differences across sectors in elasticities of substitution between capital and labor. In contrast, the incidence of the corporate tax in the MPM may fall 100 percent on capital regardless of sector differences in substitution elasticities. The difference between the two models in the deadweight loss from corporate taxation is also striking. Using the Harberger - Shoven data and assuming unitary substitution and demand elasticities, the deadweight loss is over ten times larger in the CES version of the MPM than in the Harberger Model. Part of the explanation for this difference is that in the Harberger Model only the difference in the average corporate tax in the two sectors is distortionary, while the entire tax is distortionary in the MPM. A second reason for the larger excess burden in the MPM is that the MPM has a very large, indeed infinite, substitution elasticity in demand between corporate and noncorporate goods; in contrast, applications of the Harberger Model assume this elasticity is quite small.

The precautionary motive for saving is an important issue that is receiving increasing attention. Part of the motivation for this interest stems from the post war coincidence of two trends, one a decline in the U.S. rate of saving and the other an increase in insurance of various types, including unemployment insurance, annuity insurance, disability insurance, and health insurance. This paper examines precautionary saving for uncertain health care payments using a simple two period and illustrates this model''s theoretical insights through simulations of a 55 period life cycle model. While derived from a highly stylized model, the simulations give the impression that precautionary saving for uncertain health expenditures could explain a large amount of aggregate savings. Adding uncertain health expenditures to the model''s economy raises long run savings by almost one third, assuming individuals self insure. Arrangements for insuring uncertain health expenditures also have potentially quite sizable effects on savings. Introducing actuarially fair insurance to the economy with uncertain health expenditures reduces the steady state level of wealth of that economy by 12 percent. Switching from the fair insurance arrangement to a Medicaid-type program with an asset test further reduces steady state wealth by 75 percent.