The long-run poverty and gender impacts of mobile money, with Tavneet Suri, 2016, Science Magazine.  (Abstract)

Results of a large-scale behavioral intervention on road safety in Kenya, with James Habyarimana, 2015, Proceedings of the National Academy of Sciences.

Transaction networks: Evidence from mobile money in Kenya, with Adam Ray and Tavneet Suri, 2013, American Economic Review.

Risk sharing and transactions costs: Evidence from Kenya’s mobile money revolution, with Tavneet Suri, 2013, American Economic Review.

Documenting the birth of a financial economy, with Tavneet Suri and Thomas Stoker, 2012, Proceedings of the National Academy of Sciences

State vs Consumer Regulation: An Evaluation of Two Road Safety Interventions in Kenya, with James Habyarimana, forthcoming, in NBER Volume on African Economic Successes

Heckle and chide: results of a randomized road safety intervention in Kenya, with James Habyarimana, 2011, Journal of Public Economics

Effects of a mobile phone short message service on antiretroviral treatment adherence in Kenya (WelTel Kenya1): a randomized trial, with Richard Lester et al., 2010, The Lancet

The promise of health: Evidence of the Impact of Health on Income and Well-Being, 2010, in The Oxford Handbook of Health Economics, edited by Sherry Glied and Peter Smith

Health worker preferences for job attributes in Ethiopia: Results from a discrete choice experiment, with Kara Hanson. Shorter paper “Incentives Could Induce Ethiopian Doctors and Nurses to Work in Rural Settings,” 2010,  Health Affairs

Monetary Theory and Electronic Money: Reflections on the Kenyan Experience, 2010, Economic Quarterly, with Tavneet Suri and Robert Townsend

Conditioning aid on social expenditures, 2008, Economics and Politics

Protecting the vulnerable: the trade-off between risk reduction and public insurance, 2007 World Bank Economic Review, with Shanta Devarajan

Employee cost-sharing and the welfare effects of Flexible Spending Accounts, 2006, Journal of Public Economics, with Arik Levinson and Sjamsu Rahardja

Social conflict and gradual political succession: An illustrative model, 2006, Scandinavian Journal of Economics, with Roger Lagunoff

Optimal risk adjustment in a model with adverse selection and spatial competition, 2006, Journal of Health Economics

Dynamic enfranchisement, 2006, Journal of Public Economics, with Roger Lagunoff

Purchasing health care services from providers with unknown altruism, 2005 Journal of Health Economics

Comparing the distortionary effects of alternative in-kind intergovernmental transfers, 2005, Public Finance Review

Financing Pharmaceutical Innovation: How Much Should Poor Countries Contribute?, 2005, World Bank Economic Review, with Jenny Lanjouw

The organization of public service provision, 2004, Journal of Public Economic Theory

Contracting for health services: An evaluation of recent reforms in Nicaragua, 2003 Health Policy and Planning

Institutional design and the closure of public facilities in transition economies, 2002, Economics of Transition

Designing incentives for rural health care providers in developing countries, 2002. Journal of Development Economics

Equilibrium in insurance markets with ex ante adverse selection and ex post moral hazard, 2001, Journal of Public Economics.

The treatment of financial services under a broad based consumption tax, 2001, National Tax Journal.

Controlling risk selection incentives when health insurance contracts are endogenous, 2001, Journal of Public Economics.

Public Intervention in Health Insurance Markets: Theory and Four Examples from Latin AmericaWorld Bank Research Observer, 2001.

Social investment funds: An organizational approach to improved development assistanceWorld Bank Research Observer, 2001.

The public economics of tuberculosis controlHealth Policy, 2001.

Public spending on health care: how are different criteria related? A second opinionHealth Policy, 2000.

Intergenerational risk sharing and health insurance financing, 1998, Economic Record.

Welfare-Improving Health Expenditure Subsidies, 1997 American Economic Review (with Louise Sheiner).

Production Efficiency and the Design of Temporary Investment IncentivesJournal of Public Economics(with Alan D. Viard), July 1996.

Some Potential Effects of Tax Caps on Health Insurance Pricing and CoverageNational Tax Journal, 1994.