Using the result that under the null hypothesis of no misspecification an asymptotically efficient estimator must have zero asymptotic covariance with its difference from a consistent but asymptotically inefficient estimator, specification tests are devised for a number of model specifications in econometrics. Local power is calculated for small departures from the null hypothesis. An instrumental variable test as well as tests for a time series cross section model and the simultaneous equation model are presented. An empirical model provides evidence that unobserved individual factors are present which are not orthogonal to the included right-hand-side variable in a common econometric specification of an individual wage equation.

/pdf/specification-tests-in-econometrics-9sg4xr62ii.pdf

Specification Tests in Econometrics

This paper examines whether the Solow growth model is consistent with the international variation in the standard of living. It shows that an augmented Solow model that includes accumulation of human as well as physical capital provides an excellent description of the cross-country data. The paper also examines the implications of the Solow model for convergence in standards of living, that is, for whether poor countries tend to grow faster than rich countries. The evidence indicates that, holding population growth and capital accumulation constant, countries converge at about the rate the augmented Solow model predicts. This paper takes Robert Solow seriously. In his classic 1956 article Solow proposed that we begin the study of economic growth by assuming a standard neoclassical production function with decreasing returns to capital. Taking the rates of saving and population growth as exogenous, he showed that these two vari- ables determine the steady-state level of income per capita. Be- cause saving and population growth rates vary across countries, different countries reach different steady states. Solow's model gives simple testable predictions about how these variables influ- ence the steady-state level of income. The higher the rate of saving, the richer the country. The higher the rate of population growth, the poorer the country. This paper argues that the predictions of the Solow model are, to a first approximation, consistent with the evidence. Examining recently available data for a large set of countries, we find that saving and population growth affect income in the directions that Solow predicted. Moreover, more than half of the cross-country variation in income per capita can be explained by these two variables alone. Yet all is not right for the Solow model. Although the model correctly predicts the directions of the effects of saving and

/pdf/a-contribution-to-the-empirics-of-economic-growth-27cl5gkqam.pdf

A Contribution to the Empirics of Economic Growth

An intertemporal model for the capital market is deduced from the portfolio selection behavior by an arbitrary number of investors who aot so as to maximize the expected utility of lifetime consumption and who can trade continuously in time. Explicit demand functions for assets are derived, and it is shown that, unlike the one-period model, current demands are affected by the possibility of uncertain changes in future investment opportunities. After aggregating demands and requiring market clearing, the equilibrium relationships among expected returns are derived, and contrary to the classical capital asset pricing model, expected returns on risky assets may differ from the riskless rate even when they have no systematic or market risk. ONE OF THE MORE important developments in modern capital market theory is the Sharpe-Lintner-Mossin mean-variance equilibrium model of exchange, commonly called the capital asset pricing model.2 Although the model has been the basis for more than one hundred academic papers and has had significant impact on the non-academic financial community,' it is still subject to theoretical and empirical criticism. Because the model assumes that investors choose their portfolios according to the Markowitz [21] mean-variance criterion, it is subject to all the theoretical objections to this criterion, of which there are many.4 It has also been criticized for the additional assumptions required,5 especially homogeneous expectations and the single-period nature of the model. The proponents of the model who agree with the theoretical objections, but who argue that the capital market operates "as if" these assumptions were satisfied, are themselves not beyond criticism. While the model predicts that the expected excess return from holding an asset is proportional to the covariance of its return with the market

http://jpkc.fudan.edu.cn/picture/article/296/c7/92/0e8c302443d092d8b77a256079cf/3a6483db-591a-42b5-b904-e2430eb26c6a.pdf

An intertemporal capital asset pricing model

Norms have never been absent from the study of international politics, but the sweeping “ideational turn” in the 1980s and 1990s brought them back as a central theoretical concern in the field. Much theorizing about norms has focused on how they create social structure, standards of appropriateness, and stability in international politics. Recent empirical research on norms, in contrast, has examined their role in creating political change, but change processes have been less well-theorized. We induce from this research a variety of theoretical arguments and testable hypotheses about the role of norms in political change. We argue that norms evolve in a three-stage “life cycle” of emergence, “norm cascades,” and internalization, and that each stage is governed by different motives, mechanisms, and behavioral logics. We also highlight the rational and strategic nature of many social construction processes and argue that theoretical progress will only be made by placing attention on the connections between norms and rationality rather than by opposing the two.

/pdf/international-norm-dynamics-and-political-change-37ig9r9dlq.pdf

International Norm Dynamics and Political Change

Is public expenditure productive

The present paper analyses the effect of the interaction between tax rules and inflation on the size and allocation of the capital stock with particular emphasis on the role of owner-occupied housing. The analysis is developed in the framework of an economy that is in equilibrium and in which a constant fraction of disposable income is saved. In this model, I show that, with current U.S. tax laws, an increase in the rate of inflation reduces the equilibrium amount of business capital employed in the economy and raises the amount of housing capital. The analysis also shows that a higher rate of inflation lowers the real net-of-tax rate of return to the provider of business capital. In a richer model than the current one, i.e., in a model in which the rate of personal saving was an increasing function of the net rate of return, a higher inflation rate would therefore lower the rate of saving. The present analysis also shows that permitting firms to depreciate investments more rapidly for tax purposes increases the accumulations of business capital but that, unless firms are permitted to expense all in- vestment immediately, an increase in inÂ£ lat ion continues to depress the accumulation of business capital.

https://papers.ssrn.com/sol3/Delivery.cfm?abstractid=349139

Inflation, Tax Rules, and the Accumulation of Residential and Nonresidential Capital

This paper is an analytic comment on two chapters of the Economic Report of the President for 2006. Chapter One deals with the economy in 2005 and the outlook for the future. The chapter provides a detailed analysis of the expansion in 2005 but not an explanation of why the expansion occurred despite the sharp rise in oil prices. I discuss the role of easy money in stimulating mortgage borrowing which generated negative savings in 2005. Looking ahead, I comment on the risk to inflation implied by the rising unit labor costs over the past four years. Chapter six deals with the international position of the United States. It provides a useful analysis of capital flows to the United States and the reasons why other countries have current account surpluses. It does not deal with the role of the dollar or the nature of the adjustment that might occur to reduce the US current account deficit. I present some comments on those issues.

/pdf/the-2006-economic-report-of-the-president-comment-on-chapter-464pk4mi4y.pdf

The 2006 Economic Report of the President: Comment on Chapter One (The Year in Review) and Chapter Six (The Capital Account Surplus)

We Can Lower Oil Prices Now

Cost Benefit Analysis in Developing Countries: The Evaluation of Projects Financed by Aid and External Loans

This paper reviews the studies by Robert Barro, Michael Darby, and Alicia Munnell, as well as my own earlier time-series study and presents new estimates using the revised national income-account data. The basic estimates of each of the four studies point to an economically substantial effect that is very unlikely to have been observed by chance alone. Although including variables like the Government surplus (Barro) or a measure of real money balance (Darby) can lower the estimated coefficient of the social security wealth variable, this paper explains their inappropriateness in the aggregate consumption function. Use of new data on national income and its components from the Department of Commerce improves my earlier estimates and shows that the unemployment variable does not belong in the consumption function once the level of income and its rate of change are included.

Martin Feldstein

Papers

Inflation, Tax Rules, and the Accumulation of Residential and Nonresidential Capital

The 2006 Economic Report of the President: Comment on Chapter One (The Year in Review) and Chapter Six (The Capital Account Surplus)

We Can Lower Oil Prices Now

Cost Benefit Analysis in Developing Countries: The Evaluation of Projects Financed by Aid and External Loans

The Effect of Social Security on Private Savings: The Time Series Evidence