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1. Commitment to Development Index 2012

Author:
David Roodman
Publication Date:
10-2012
Content Type:
Policy Brief
Institution:
Center for Global Development
Abstract:
Why does the CDI matter? Because in an increasingly integrated world, the behavior of rich countries can profoundly affect the lives of people in poor countries and because poverty and weak institutions in developing countries can breed public health crises, security threats, and economic crises that know no borders. Committing to policies that promote develop- ment and well-being is a global imperative—no human being should be denied the chance to live free of poverty and oppression and to enjoy a basic standard of education and health. The CDI countries, all democracies, preach concern for human life and dignity within their own borders; the Index looks at whether rich countries' actions match their words.
Topic:
Development, Economics, Education, Health, and Poverty

2. Due Diligence: An Impertinent Inquiry into Microfinance

Author:
David Roodman
Publication Date:
01-2012
Content Type:
Policy Brief
Institution:
Center for Global Development
Abstract:
Microfinance: Few development ideas have been so buoyed by high expectations in recent decades, and few have been so buffeted by difficulties in recent years. Images of microfinance lifting people out of poverty now compete with ones of the poor driven by debt to suicide. Where does the truth lie? David Roodman investigates in Due Diligence. He finds no evidence that small loans lift people out of poverty en masse but argues that financial services, like clean water and electricity, are essential to a modern life. The practical question is not whether microfinance should continue, but how it can play to its strengths, which lie in providing useful services to millions of poor people in a businesslike way. Due Diligence is the most complete investigation ever into the sources and consequences of microfinance. Rood - man explores the financial needs of poor people, the history of efforts to meet those needs, the business realities of doing so, and the arguments and evidence about how well modern microfinance is succeeding.
Topic:
Debt, Development, Economics, Globalization, Poverty, and Foreign Direct Investment

3. The Arc of the Jubilee

Author:
David Roodman
Publication Date:
10-2010
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The Jubilee 2000 movement, which called for the cancellation of the foreign debts of the poorest nations, reached its zenith in the late 1990s and 2000-and then, by design, shut down. In the space of a few years, it became one of the most successful international, nongovernmental movements in history. As part of a larger, ongoing project to understand the consequences and lessons of the episode, David Roodman provides thumbnail assessments of Jubilee 2000 from several perspectives, deemphasizing anecdotes and statistics in favor of major themes.
Topic:
Debt, Development, Economics, and Non-Governmental Organization

4. The Impact of Microcredit on the Poor in Bangladesh: Revisiting the Evidence

Author:
David Roodman and Jonathan Morduch
Publication Date:
06-2009
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The most-noted studies on the impact of microcredit on households are based on a survey fielded in Bangladesh in the 1990s. Contradictions among them have produced lasting controversy and confusion. Pitt and Khandker (PK, 1998) apply a quasi-experimental design to 1991–92 data; they conclude that microcredit raises household consumption, especially when lent to women. Khandker (2005) applies panel methods using a 1999 resurvey; he concurs and extrapolates to conclude that microcredit helps the extremely poor even more than the moderately poor. But using simpler estimators than PK, Morduch (1999) finds no impact on the level of consumption in the 1991–92 data, even as he questions PK's identifying assumptions. He does find evidence that microcredit reduces consumption volatility. Partly because of the sophistication of PK's Maximum Likelihood estimator, the conflicting results were never directly confronted and reconciled. We end the impasse. A replication exercise shows that all these studies' evidence for impact is weak. As for PK's headline results, we obtain opposite signs. But we do not conclude that lending to women does harm. Rather, all three studies appear to fail in expunging endogeneity. We conclude that for non-experimental methods to retain a place in the program evaluator's portfolio, the quality of the claimed natural experiments must be high and demonstrated.
Topic:
Development, Economics, Foreign Aid, and Foreign Direct Investment
Political Geography:
Bangladesh, South Asia, and Asia

5. Through the Looking-Glass, and What OLS Found There: On Growth, Foreign Aid, and Reverse Causality

Author:
David Roodman
Publication Date:
01-2008
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The cross-country literature on foreign aid effectiveness has relied on the use of instruments to distinguish causality from mere correlation. This paper uses simple non-instrumental techniques in the spirit of Granger to demonstrate that the main aid-growth connection is a negative causal relationship from growth to aid—aid, that is, as a fraction of recipient GDP. Coarsely, when GDP goes up, aid/GDP goes down. The endogeneity of aid, long-suspected, is real. Less understood is that adding certain common controls to regressions puts this relationship through the looking-glass, flipping both its sign and apparent direction: aid seems to cause growth. Ideally, instrumentation expunges the endogeneity shown here. In practice, estimates of aid's impact have run into problems. Autocorrelation in the errors is widespread, and can render endogenous lagged variables used as regressors or instruments. The pitfalls of “difference” and “system” include invalidity and proliferation of instruments. Multicollinearity in term pairs of interest, such as aid and aid or “project” and “program” aid, can amplify endogeneity bias. The combination of specification problems and widespread fragility (shown in earlier work) leads to pessimism about the ability of cross-country econometrics to demonstrate aid effectiveness. This does not rule an average positive effect, nor does it contradict the fact that aid has saved millions of lives, but it does suggest that the average effect on economic growth is too small to be detected statistically.
Topic:
Economics, Humanitarian Aid, and International Political Economy

6. A Short Note on the Theme of Too Many Instruments

Author:
David Roodman
Publication Date:
08-2007
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The “difference” and “system” generalized method of moments (GMM) estimators for dynamic panel models are growing steadily in popularity. The estimators are designed for panels with short time dimensions (T), and by default they generate instruments sets whose number grows quadratically in T. The dangers associated with having many instruments relative to observations are documented in the applied literature. The instruments can overfit endogenous variables, failing to expunge their endogenous components and biasing coefficient estimates. Mean while they can vitiate the Hansen J test for joint validity of those instruments, as well as the difference-in-Sargan/Hansen test for subsets of instruments. The weakness of these specification tests is a particular concern for system GMM, whose distinctive instruments are only valid under a non-trivial assumption. Judging by current practice, many researchers do not fully appreciate that popular implementations of these estimators can by default generate results that simultaneously are invalid yet appear valid. The potential for type I errors—false positives—is therefore substantial, especially after amplification by publication bias. This paper explains the risks and illustrates them with reference to two early applications of the estimators to economic growth, Forbes (2000) on income inequality and Levine, Loayza, and Beck (LLB, 2000) on financial sector development. Endogenous causation proves hard to rule out in both papers. Going forward, for results from these GMM estimators to be credible, researchers must report the instrument count and aggressively test estimates and specification test results for robustness to reductions in that count.
Topic:
Development, Economics, Political Economy, and Third World

7. How to Do xtabond2: An Introduction to "Difference" and "System" GMM in Stata

Author:
David Roodman
Publication Date:
12-2006
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The Arellano-Bond (1991) and Arellano-Bover (1995)/Blundell-Bond (1998) linear generalized method of moments (GMM) estimators are increasingly popular. Both are general estimators designed for situations with “small T, large N” panels, meaning few time periods and many individuals; with independent variables that are not strictly exogenous, meaning correlated with past and possibly current realizations of the error; with fixed effects; and with heteroskedasticity and autocorrelation within individuals. This pedagogic paper first introduces linear GMM. Then it shows how limited time span and the potential for fixed effects and endogenous regressors drive the design of the estimators of interest, offering Stata-based examples along the way. Next it shows how to apply these estimators with xtabond2. It also explains how to perform the Arellano-Bond test for autocorrelation in a panel after other Stata commands, using abar.
Topic:
Development, Economics, and Science and Technology

8. An Index of Donor Performance

Author:
David Roodman
Publication Date:
11-2006
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The Commitment to Development Index of the Center for Global Development rates 21 rich countries on the “development-friendliness” of their policies. It is revised and updated annually. The component on foreign assistance combines quantitative and qualitative measures of official aid, and of fiscal policies that support private charitable giving. The quantitative measure uses a net transfers concept, as distinct from the net flows concept in the net Official Development Assistance measure of the Development Assistance Committee. The qualitative factors are: a penalty for tying aid; a discounting system that favors aid to poorer, better-governed recipients; and a penalty for “project proliferation.” The charitable giving measure is based on an estimate of the share of observed private giving to developing countries that is attributable to a) lower overall taxes or b) specific tax incentives for giving. De-spite the adjustments, overall results are dominated by differences in quantity of official aid given. This is because while there is a seven-fold range in net concessional transfers/GDP among the scored countries, variation in overall aid quality across donors appears far lower, and private giving is generally small. Denmark, the Netherlands, Norway, and Sweden score highest while the largest donors in absolute terms, the United States and Japan, rank at or near the bottom. Standings by the 2006 methodology have been relatively stable since 1995.
Topic:
International Relations, Development, Economics, and Humanitarian Aid
Political Geography:
United States, Japan, Norway, and Netherlands

9. Microfinance as Business

Author:
David Roodman and Uzma Qureshi
Publication Date:
11-2006
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
IN THIS PAPER, we analyze microfinance institutions (MFIs) as businesses, asking how some MFIs succeed in reducing and covering costs, earning returns, attracting capital, and scaling up. We are interested in MFIs that are financially self-sufficient (covering the cost of daily operations as well as the cost of capital at a commercial rate) or merely operationally self-sufficient (not covering capital costs) or only, say, 90% operationally self-sufficient. All such MFIs strive for efficiency and are in many respects businesslike.
Topic:
Civil Society, Development, Economics, and Markets

10. Competitive Proliferation of Aid Projects: A Model

Author:
David Roodman
Publication Date:
06-2006
Content Type:
Working Paper
Institution:
Center for Global Development
Abstract:
The proliferation of aid projects may overburden recipient governments with reporting requirements, donor visits, and other administrative overhead, siphoning off scarce domestic recipient resources, such as tax revenue or the time of skilled government officials, from directly productive use. But greater oversight may also improve the administration of projects, increasing development. I present a model of aid projects that reflects both sides of this coin. It posits a distinction between national-level governance and project-level governance. A donor can raise project-level governance above the baseline national level by requiring oversight activities of the recipient, although the benefits from doing so are less where national-level governance is already high. The model assumes that larger projects demand proportionally less oversight activity from the recipient. Comparative statics analysis suggests that to maximize development, projects should be larger where aid volume is higher, to avoid overburdening recipient administrative capacity; where recipient resources are scarcer, for the same reason; and where national governance is good, since the marginal benefit of oversight is then lower. A multi-donor generalization shows how donors that are imperfectly altruistic, caring most about the success of their own projects, will tend to sink into competitive proliferation, in which each donor subdivides its aid budget into smaller projects to raise the marginal productivity of the recipient's resources in those projects and attract them away from other donors. The inefficiency arises from the lack of a market among donors for recipient resources. In a Nash equilibrium, competitive proliferation reduces overall development. But the smallest (selfish) donors can gain. This would discourage them from cooperating with other donors to contain competitive proliferation.
Topic:
Development, Economics, Government, and Humanitarian Aid