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Publications (29)
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Social scientists are increasingly engaging in experimental research projects of importance for public policy in developing areas. While this research holds the possibility of producing major social benefits, it may also involve manipulating populations, often without consent, sometimes with...
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– Definitions and Diagrams
The fundamental problem of external validity is not to generalize from one experiment, so much as to experimentally test generalizable theories. That is, theories that explain the systematic variation of causal effects across contexts. Here we show how the graphical language of causal diagrams can...
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In recent years, randomized controlled trials have become increasingly popular in the social sciences. In development economics in particular, their use has attracted considerable debate in relation to the identification of ‘what works’ in development policy. This paper focuses on a core topic in...
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– Opportunities and Challenges
‘Ancillary experiments’ are a new technique whereby researchers use a completed experiment conducted by others to recover causal estimates of a randomized intervention on new outcomes. The method requires pairing new outcome data with randomized treatments the researchers themselves did not oversee...
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– Towards Experiments?
In examining the study of government performance, this paper asks whether field experiments can improve the explanatory precision of results generated by public opinion surveys. Survey research on basic health and education services sub-Saharan Africa shows that the perceived ‘user friendliness’ (or...
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– Experimental and Non-Experimental Methods in Development Economics
This paper provides a survey of six widely used non-experimental methods for estimating the impact of programmes in the context of developing economies (instrumental variables, regression discontinuity, direct matching, propensity score matching, linear regression and non-parametric methods, and...
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– Better Policies? Better Politics?
The paper provides a comparative analysis of the incidence of evaluation methods in antipoverty transfer programmes in Latin America and sub-Saharan Africa. The paper identifies two broad explanations for the incidence of evaluation in antipoverty transfer programmes in developing countries, one...
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There has been much recent research on the world distribution of income, but also growing recognition of the importance of other contributions to well-being, including those of household wealth. Wealth is important in providing security and opportunity, particularly in poorer countries that lack...
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We provide the first estimate of the level and distribution of global household wealth. Mean assets and debts within countries are measured, partly or wholly, for 38 countries using household balance sheet and survey data centred on the year 2000. Determinants of mean financial assets, non-financial...
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Housing is the single most important component of personal wealth in most countries. The special characteristics of housing markets are therefore key to understanding personal portfolios, saving, the household distribution of wealth, and the monetary transmission mechanism. This paper discusses how...
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– Evidence on the Level and Distribution across Selected Countries
This paper discusses issues that arise in the comparison of estimates of wealth holdings and their distribution in light of data for selected OECD countries. We find large differences in the level of wealth, depending on whether the mean or median levels are compared across countries. Sensitivity of...
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This paper investigates some major changes in the wealth distribution in China using the data from two national household surveys conducted in 1995 and 2002. The surveys collected rich information on household wealth and its components, enabling a detailed analysis of changes in wealth distribution...
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All countries in transition experienced increases in inequality. They have also undertaken massive privatization of key asset housing, often on give-away terms. Are these two phenomena related? Has transfer of ownership rights to residents slowed down the inequality increases or it pushed it up...
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The aim of this paper is to examine the concentration of wealth among the group of top wealth holders, defined as those with wealth in excess of a high cut off. The paper begins by considering the definition of this cut off, analogous to the definition of a poverty line at the other end of the...
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Does the existence of formal title to land and real estate matter for the distribution of wealth? This paper reviews the empirical literature on the economic impact of land and real estate administration systems across countries. This paper argues that a functioning credit market for secured credit...
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– Evidence from Rural Ethiopia
This paper considers asset holdings in rural Ethiopia. It shows that households own mostly non-financial assets and that the composition of asset portfolios varies significantly with the household’s overall wealth and its exposure to uncertainty. As regards the distribution of assets, inequality is...
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