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This article is about the economics of migrant remittances sent to developing countries. I review the overall magnitude of remittances and what current research reveals about the motivations for migrant remittances and what effects they have. I discuss field experimental evidence on migrant desires for control over the uses of their remittances. I highlight some key distinctive characteristics of remittances—such as their high frequency and relatively small individual magnitudes—as well as recent experimental evidence on the effect of reductions in remittance transaction fees, and outline a research agenda on the microeconomics of remittance decision making. Finally, I discuss what the future holds for remittances, considering aggregate trends but also approaches likely to be taken by international development agencies, national governments, the private sector, and academic economists.

How do households respond to overseas members' economic shocks? Overseas Filipinos in dozens of countries experienced sudden, heterogeneous changes in exchange rates during the 1997 Asian financial crisis. Appreciation of a migrant's currency against the Philippine peso leads to increases in household remittances from overseas. The estimated elasticity of Philippine-peso remittances with respect to the exchange rate is 0.60. Positive migrant shocks lead to enhanced human capital accumulation and entrepreneurship in origin households. Child schooling and educational expenditure rise, while child labour falls. Households also work more hours in self-employment, and become more likely to start relatively capital-intensive household enterprises.

We examine the effect of early-life rainfall on the health, education, and socioeconomic outcomes of Indonesian adults. We link historical rainfall for each individual's birth year and birth location with adult outcomes from the 2000 Indonesia Family Life Survey (IFLS). Higher early-life rainfall has large positive effects on the adult outcomes of women, but not of men. Women with 20 percent higher rainfall (relative to the local norm) are 0.57 centimeters taller, complete 0.22 more schooling grades, and live in households scoring 0.12 standard deviations higher on an asset index. Schooling attainment appears to mediate the impact on adult women's socioeconomic status. (JEL I12, I21, J16, O15)

Increased enforcement can displace crime to alternative lawbreaking methods. This paper examines a customs reform in the Philippines that raised enforcement against a specific method of avoiding import duties. Increased enforcement applied only to shipments from some countries, so shipments from other countries serve as a control group. Increased enforcement reduced the targeted duty-avoidance method, but caused substantial displacement to an alternative method. The hypothesis of zero change in total duty avoidance cannot be rejected. Displacement was greater for products with higher tariff rates and import volumes, consistent with the existence of fixed costs of switching to alternative duty-avoidance methods.

The Green Revolution, which bolstered agricultural yields and economic well-being in Asia and Latin America beginning in the 1960s, largely bypassed sub-Saharan Africa. We study the first randomized controlled trial of a government-implemented input subsidy program (ISP) in Africa intended to foment a Green Revolution. We find that this temporary subsidy for Mozambican maize farmers stimulates Green Revolution technology adoption and leads to increased maize yields. Effects of the subsidy persist in later unsubsidized years. In addition, social networks of subsidized farmers benefit from spillovers, experiencing increases in technology adoption, yields, and beliefs about the returns to the technologies. Spillovers account for the vast majority of subsidy-induced gains. ISPs alleviate informational market failures, stimulating learning about new technologies by subsidy recipients and their social networks.

This paper distinguishes between target-earnings and life cycle motivations for return migration by examining how Philippine migrants' return decisions respond to major, unexpected exchange rate changes in their overseas locations (due to the Asian financial crisis). Overall, the evidence favors the life cycle explanation: more favorable exchange rate shocks lead to fewer migrant returns. A 10% improvement in the exchange rate reduces the 12-month return rate by 1.4 percentage points. However, some migrants appear motivated by target-earnings considerations: in households with intermediate foreign earnings, favorable exchange rate shocks have the least effect on return migration, but lead to increases in household investment.

We implemented a randomized intervention among Malawian farmers aimed at facilitating formal savings for agricultural inputs. Treated farmers were offered the opportunity to have their cash crop harvest proceeds deposited directly into new bank accounts in their own names, while farmers in the control group were paid harvest proceeds in cash (the status quo). The treatment led to higher savings in the months immediately before the next agricultural planting season and raised agricultural input usage in that season. We also find positive treatment effects on subsequent crop sale proceeds and household expenditures. Because the treatment effect on savings was only a small fraction of the treatment effect on the value of agricultural inputs, mechanisms other than alleviation of savings constraints per se are needed to explain the treatment’s impact on input utilization. We discuss other possible mechanisms through which treatment effects may have operated.

We ask how export demand shocks associated with the Asian financial crisis affected Chinese exporters. We construct firm-specific exchange rate shocks based on the precrisis destinations of firms' exports. Because the shocks were unanticipated and large, they are a plausible instrument for identifying the impact of exporting on firm productivity and other outcomes. We find that firms whose export destinations experience greater currency depreciation have slower export growth and that export growth leads to increases in firm productivity and other firm performance measures. Consistent with \"learning-by-exporting,\" the productivity impact of export growth is greater when firms export to more developed countries.

In this study, the zeta potential on the surface of copper powder was adjusted by changing the pH value and adding cetyltrimethylammonium bromide (CTAB). Silica sol was coated directly on copper powder through physical adsorption. The as-prepared SiO 2 -coated copper powders were mixed with organic vehicle and screen printed on low-temperature co-fired ceramic substrate to form copper films. The binder-burn-out process of the films was carried out at 550 °C for 1 h in N 2 /H 2 O atmosphere and then sintered at 910 °C for 1 h in N 2 atmosphere. The results proved that zeta potential had a major effect on the coating morphology of SiO 2 -coated copper powder. The SiO 2 -coated copper powder with a weight ratio of 1% showed a uniform and smooth surface. When the CTAB concentration was 1 × 10 –4  mol/L, the copper powder exhibited the highest zeta potential of 98.2 mV, and the copper film had the best conductivity with a sheet resistance of 1.8 mΩ/□.

We implemented a randomized field experiment in Malawi examining borrower responses to being fingerprinted when applying for loans. This intervention improved the lender's ability to implement dynamic repayment incentives, allowing it to withhold future loans from past defaulters while rewarding good borrowers with better loan terms. As predicted by a simple model, fingerprinting led to substantially higher repayment rates for borrowers with the highest ex ante default risk, but had no effect for the rest of the borrowers.We provide unique evidence that this improvement in repayment rates is accompanied by behaviors consistent with less adverse selection and lower moral hazard.