Solow vs. Solow: Notes on Identification and Interpretation in the Empirics of Growth and Development

Most empirical studies of long-run growth refer to one of the two seminal contributions by Robert Solow in 1956 and 1957. His work shows that in order to estimate the relative roles of factor accumulation and technology in development, an a priori identification assumption is needed about the nature of technical change. This specific assumption differs across the two Solow papers. I show that starting with the identification assumption made by Solow in 1956, one should expect to find that differences in technology rather than differences in factor accumulation explain most if not all of the observed long-run differences in output per worker. The opposite interpretation appears to prevail in parts of the recent literature on the empirics of growth. JEL no. O4     

SOURCES OF ECONOMIC GROWTH AND TECHNOLOGY TRANSFER IN SUB‐SAHARAN AFRICA1

This paper provides some empirical evidence on the sources of growth in sub‐Saharan Africa (SSA). Within the classical convergence framework, several macroeconomic, socio and political factors are identified as affecting the steady state growth paths of the SSA countries. The rejection of the constant technology growth rate assumption implied by the linearised Solow‐Swan growth specification suggests differences in the economies' technology growth rates. An endogenous technology growth model is estimated to measure contributions of diminishing returns and technology transfer to the rate of conditional convergence in the region. The results carry important policy implications for improving the standard of living and economic growth rate of African countries.     

Persistent differences in national productivity growth rates with a common technology and free capital mobility: The roles of private thrift, public debt, capital taxation, and policy toward human capital formation

The paper develops a two-country endogenous growth model to investigate possible causes for the existence and persistence of productivity growth differentials between nations despite a common technology, constant returns to scale, and perfect international capital mobility. Private consumption is derived from a three-period overlapping generations specification. The source of productivity (growth) differentials in our model is the existence of a nontraded capital good (“human capital”) whose augmentation requires a nontraded current input (time spent by the young in education rather than leisure). We consider the influence on productivity growth differentials of private thrift, public debt, the taxation of capital and savings, and policy toward human capital formation.     

Intertemporal production and asset pricing: a duality approach

This paper analyzes a firm's intertemporal optimization problemunder uncertainty and presents a new asset pricing model fromthe vantage point of the production side of the economy usingthe duality principle. The intertemporal profit-maximizationproblem is formulated using the familiar cost function, andthe production Euler equation that encapsulates the joint behaviorof production and asset returns is derived. An asset's riskis measured by its covariance with the stochastic discount factorrepresented by the ratio of discounted marginal costs. The riskpremium is determined by the conditional covariances of assetreturns with output growth scaled by the degree of scale economiesand with input price changes weighted by the cost share of aninput. The proposed model has the standard structure of a multibetapricing model and suggests four economic risk factors–outputgrowth, the return on human capital, the return on physicalcapital, and technology shocks–for use in empirical analysis.     

Reducing Public Debt under Dynamic Efficiency: Transitional Dynamics in Diamond's OLG Model

Fiscal retrenchment is on the political agenda in the U.S. as well as in the EU. Utilizing Diamond's [1965] classic OLG growth model with internal debt, this paper focuses on temporarily adjusting the ratio of the primary budget surplus to GDP to achieve a target debt to GDP ratio lower than its initial level in the case of dynamic efficiency. The transitional dynamics of the debt to GDP and of the capital–output ratios are rigorously analyzed. It is shown that reducing the public debt to GDP ratio diminishes private capital intensity too.The author thanks, without implication, an anonymous referee and Laurie Conway for extremely useful advice and comments.     

Openness, Investment and Growth

In the empirical growth literature both investment and opennessto international trade have been identified as important determinantsof growth. These relationships appear to be robust in a numberof specifications. However, Sachs and Warner claim that opennessis such an important determinant of investment that the coefficienton investment will be insignificant in growth regressions, whichalready account for openness. I re-examine this result and canonly support it if I use their model specification and estimationmethod. I suggest that their ordinary least squares estimationsuffers from both endogeneity and omitted variable bias. Usingpanel data analysis, I show that ignoring unobserved country-specificeffects and endogeneity problems cause investment to be insignificant.Estimating the model with the Blundell and Bond system generalmethod of moments estimator, which allows me to address theomitted variable as well as the endogeneity bias, I find thatinvestment is significant in the Sachs–Warner model despitecontrolling for openness. Thus, my regressions confirm thatopenness has a significant, positive effect on income. However,this variable is not so important that it drives investmentout of the model. My re-examination of the Sachs–Warnermodel shows that results from single cross-country growth regressionscan be misleading when unobserved country-specific effects andendogeneity problems are ignored.     

On the hump-shaped output effect of monetary policy in an open economy

Results of empirical research have revealed a characteristic hump-shaped effect of a monetary policy shock on output: The effect of the shock builds to a peak after several months and then gradually dies out. We analyze, in the context of a ‘new open economy macroeconomics’ model, factors that imply a hump-shaped response of output to a monetary policy shock. We find that a hump-shaped effect of a monetary policy shock on output is likely to result if the model features a “catching-up with the Joneses” effect, pricing-to-market behavior of firms, and imperfect international financial market integration. We thank two anonymous referees for very helpful comments. The usual disclaimer applies.     

Can IT be Japan's savior?

This paper constructs a multi-sector model to take explicit account of the very sharp change in the relative price between non-IT and IT goods. The model is calibrated to the Japanese economy, and its solution path from 1990 on is compared to Japan's macroeconomic performance in the 1990s. Compared to the one-sector analysis of Japan in the 1990s [Hayashi, F., Prescott, E.C., 2002. The 1990s in Japan: A lost decade. Rev. Econ. Dynam. 5, 206–235], our model does slightly better or just as well in accounting for Japan's output slump and does worse in accounting for the capital–output ratio. We also show that, to revive a 2% long-term growth in per capita GDP, Japan needs to direct 10% of private total hours to the IT sector. J. Japanese Int. Economies 19 (4) (2005) 543–567.     

Using home-biased demand to test trade theories

Using Home-Biased Demand to Test Trade Theories. — This paper proposes a discriminating hypothesis that distinguishes between two paradigms of international trade: (1) constant returns and perfect competition (CRS-PC) and (2) increasing returns and monopolistic competition (IRS-MC). The discriminating hypothesis rests on the different degree of home bias among “consumers.” It predicts a positive relationship between a country’s share in world output and a country’s share in the world home-biased expenditure if the sector is IRS-MC and no relationship if the sector is CRS-PC. Accordingly, 7 sectors (covering 54.86 per cent of industrial output) of the eight countries under investigation were associated with the IRS-MC and 10 sectors (41.15 per cent) with the CRS-PC paradigm.     

THE COMPETITIVENESS OF UK MANUFACTURING: EVIDENCE FROM IMPORTS

The paper presents an empirical analysis of the behaviour ofUK imports of manufactures, intended to develop understandingof non-price competitiveness by evaluating the impact of capacityconstraints, international specialisation, and industrial standards.Two data sets are employed: aggregate data for the period 1970–93,and a panel of 81 industries for 1985–90. Structural stabilityin a model of the former suggests that no competitiveness improvementhas occurred in domestic UK manufacturing which matches thatfound elsewhere for exports The panel model shows the importantimpact of standards on imports, while confirming that skilledlabour shortages are a key source of volatility.     

Appropriate technology in a Solovian nonlinear growth model

We propose a Solovian growth model with a convex–concaveproduction function and international technological spillovers.We test the empirical implications of the model, analysing theeffects of the productivity slowdown that followed the oil shocksof the 1970s. We argue that this slowdown, altering the worldincome distribution, affected the pattern of international technologicalspillovers, taking the poorest countries further away from thetechnological leaders, and therefore unable to exploit theirtechnologies. The result is the emergence of a poverty trapfor low-income countries.     

Empirical models of criminal behavior: How significant a factor is race?

Empirical models of the supply of criminal offenses in the United States have shown a positive relationship between the proportion of the population that is non-white (RACE) and crime rates. Though non-whites in the United States possess more “criminal capital” than the average person, such studies do not take into consideration this excess criminal capital. Since RACE and the omitted excess criminal capital are correlated, it will pick up the influence of the excess criminal capital. Using cross-sectional data from Florida’s municipalities, we show that after adjusting for excess criminal capital, RACE has no significant relationship with crime.     

Church attendance,age, and belief in the afterlife: Some additional evidence

Summary and Conclusions This mixed bag of empirical evidence does not resolve the theological and econmic questions raised in conjunction with the “afterlife capital” model of church attendance, including not only afterlife but a mixture of current benefits as well, is present in all of the evidence cited. What evidence we have to offer suggests a decline in the afterlife motivation between 1973 and 1980 and a strengthening of other current consumption motives, but the afterlife motive is clearly still present in varying degrees of strength in some religious groups. What our findings do strongly suggest is that self-reported religious intensity, which undoubtedly contains elements of current consumption benefits, is a more important determinant of church attendance than belief in an afterlife.     

Can Openness Help Make a Miracle?

Several empirical studies indicate that there is a positive relationship between openness to international trade and growth. Lucas (1988) argues that this relationship poses a paradox for neo-classical theory because trade liberalisation produces only limited level effects, not long-run growth effects, in neo-classical growth models. This paper attempts to resolve Lucas paradox by adding production sectors to the basic one-sector Solow model. This paper demonstrates that these multi-sector models are consistent with the empirical links between openness and growth. These models also blur the traditional distinctions between exogenous and endogenous growth theory. As a result, they substantially complicate the task of discriminating between exogenous and endogenous growth episodes in empirical data.     

A re-examination of the demand for money in Nigeria

Summary and Conclusion This paper reexamines the demand for money in Nigeria and finds the real income and the expected rate of inflation to be important independent variables that explain over 80 percent of the variation in the real cash balance. The study shows that, in view of the low per capita income of Nigerians, permanent income and measure income are largely the same. An important finding of this study is that, because their price level is (in large part) exogenously determined, the monetary authorities in Nigeria should be more desirous of following the constant growth rate rule. A very substantial part of the country's export (that is, oil) is especially prone to inflationary pressures due to the ease with which international inflation can be transmitted. Since the authorities can control money stock, this ‘rule’ is indicated from both the theoretical and the empirical standpoint.     

ICT and Productivity Growth in the United Kingdom

This paper develops new estimates of investment in and outputof information and communication technology (ICT). These newestimates imply that GDP growth has been significantly understated,particularly since 1994. A growth-accounting approach is employedto measure the contribution of ICT to the growth of both aggregateoutput and aggregate input. On both counts, the contributionof ICT has been rising over time. From 1989 to 1998, ICT outputcontributed a fifth of overall GDP growth. Since 1989, 55 percent of capital deepening (the growth of capital per hour worked)has been contributed by ICT capital; since 1994 this proportionhas risen to 90 per cent. ICT capital deepening accounts for25 per cent of the growth of labour productivity over 1989–98and 48 per cent over 1994–8. But even when output growthis adjusted for the new ICT estimates, both labour productivityand TFP growth are still found to slow down after 1994.     

Procyclical Productivity and Output Growth in China: An Econometric Analysis

This paper analyzes the procyclical behavior of Chinese Total Factor Productivity (TFP). It shows that measured Solow residuals are correlated to the growth rate of real imports per worker and to other macroeconomic variables that fluctuate at cyclical frequencies. The magnitude of the trend shift in TFP after the start of economic reforms in 1978 is found to be robust to the introduction of cyclical factor utilization and other systematic influences on productivity. The propagation mechanisms of macroeconomic shocks to output are also evaluated on the basis of a seven-variable VAR system. The empirical results indicate that the growing openness of the economy has contributed to sustaining the observed long run productivity increases and has raised spatial inequality.     

Revisiting the Phillips curve for Indonesia: What can we learn from regional data?

This study seeks new empirical evidence of the Phillips curve in Indonesia, an emerging and geographically diversified economy. There are three important contributions from this research. First, applying panel econometric method to exploit regional variation, the study resolves the issue of using on-target national inflation rates that potentially causes weakening inflation-output link. Second, the research examines the relevance of mining industry for output gap measurement at regional level. Third, it highlights the differences in the Phillips curve between the west and east regions owing to their different underlying economic structures. Our estimation using regional data support the validity of the Phillips curve relationship in Indonesia. Backward-looking inflation expectations, exchange rate dynamics and international prices also significantly affect inflation. In addition, the effect of output gap on inflation is larger if the mining sector is excluded from output gap measurement. Finally, we find apparent differences between the west and the eastern regions in the slope of Phillips curve, as well as in the degree of inflation persistence and exchange rate pass-through. The results are robust to alternative specification. Our study adds significantly to the empirical literature on the Phillips curve and have meaningful policy implications.