When is the rigorous impact evaluation of development projects a luxury, and when a necessity? This Paper studies one high-profile case: the Millennium Villages Project (MVP), an experimental and intensive package intervention to spark sustained local economic development in rural Africa. it...

Although measured remittances by migrant workers have soared in recent years, macroeconomic studies have difficulty detecting their effect on economic growth. This paper reviews existing explanations for this puzzle and proposes three new ones. First, it offers evidence that a large majority of...

There has been little rigorous evaluation of immigration barriers intended to improve domestic terms of employment by shrinking the workforce. We study one such barrier, a policy change that excluded almost half a million Mexican bracero seasonal agricultural workers from the United States....

Growing concern that the Millennium Development Goals (MDGs) will not be achieved by 2015 should not obscure the bigger picture that development progress has been occurring at unprecedented levels over the past thirty or more years. At the same time, the MDGs may perhaps create an unnecessary...

An important class of active labor market policy has received little rigorous impact evaluation: immigration barriers intended to improve the terms of employment for domestic workers by deliberately shrinking the workforce. Recent advances in the theory of endogenous technical change suggest...

Economists are increasingly using publicly shared data and code to check each other's work, an exercise often called ‘replication' testing. But this much-needed trend has not been accompanied by a consensus about what ‘replication' means. If a follow-up study does not ‘replicate' an...

The Millennium Development Goals (MDGs) are unlikely to be met by 2015, even if huge increases in development assistance materialize. The MDGs are a set of quantitative, time-bound targets for indicators such as poverty, education and mortality in developing countries adopted unanimously by the...

The World Bank was founded to correct failures in international capital markets. That role has shifted over the past 70 years. Modern analyses should proceed from the premise that the Bank's central goal is and should be to reduce extreme poverty. We show that the vast majority of donor...

For decades, migration economics has stressed the effects of migration restrictions on income distribution in the host country. Recently the literature has taken a new direction by estimating the costs of migration restrictions to global economic efficiency. In contrast, a new strand of research...

Many people born in low-income countries would like to leave those countries, but barriers prevent their emigration. Those barriers, according to economists' best estimates to date, cost the world economy much more than all remaining barriers to the international movement of goods and capital...