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David Roodman's Microfinance Open Book Blog


I contributed a post to CGAP's blog yesterday that summarizes the evidence to date from the randomized trials of microcredit and microsavings. Just in the last six months, enough new studies have appeared from diverse locales that we can begin to generalize. It's an important moment.

So if you're a regular follower of this blog, I encourage you to read the post. It contains things I haven't written here. The core is a couple of tables distilling the results.

Update: The post got messed up in CGAP's transition to a new web back end. So I've pasted it below.

The most rapidly obsolescing part of my book, Due Diligence, is chapter 6, which reviews the statistical evidence of the impact of microfinance on poverty. Just since I put the text to bed, working papers have appeared that test microcredit in Mongolia and Bosnia & Herzegovina and microsavings in Malawi and Chile (though the latter is marked "do not cite or circulate"). There's also the Morocco microcredit study, which I didn't catch wind of until too late in the book production. Add all these to the trials of microcredit in India and the Philippines and of microsavings in Kenya---the one that initiated this wave of research in 2009---and we have five credit studies and three savings ones.

A common exchange in the debates over the randomized studies goes like this:

"Microfinance has only been tested in a few times and places. You can't generalize from that."

"True[I often reply]. But as it is tested in more places, if patterns emerge, it will become easier to generalize."

I like to say that research is the pursuit of responsible generalization. I'm excited that just in the last few months, it has become possible to generalize more responsibly about the impacts of microfinance. Fortunately, the latest results strengthen the conclusions of my book---they don't show that microcredit cures poverty after all. More importantly, they enrich our understanding of the impacts of microfinance.

In the two tables below, I've summarized all of the above-mentioned experiments---their contexts and their consequences. In each table, the last few columns distill impacts on such outcomes such as investment, household spending (a key indicator of poverty), and "smoothing" (roughly speaking, the ability to handle financial emergencies). In these columns, "+" and "--" indicate changes up or down and "0" means basically no change. Blanks mean no information is available. The last row of the savings table shows, ahem, the results that I would display if I were citing that "do not cite or circulate" study. (It's on the web...)

I hope that you, like me, are impressed with the diversity.


Authors Where When Female % Level of randomizing Credit type (group or individual) Follow-up (months) Investment/ enterprise Wellbeing
Banerjee, Duflo, Glennerster, and Kinnan Hyderabad, India 2006–08 100 District G 12–18 + 0
Karlan & Zinman Manila, Philippines 2006–08 85 Individual I 11–22 0
Crépon, Devoto, Duflo and Parienté Morocco 2006–09 100 Village G (mostly) 24 + 0
Attanasio, Augsburg, De Haas, Fitzsimons, and Harmgart Mongolia 2008–10 100 Village G, I 8–17 Group: +

Individual: 0


+ food spending

Augsburg, De Haas, Harmgart, and Meghir Bosnia & Herzegovina 2008–10 39 Individual I ~14 + Lower food spending


Authors Where When Female % Level of randomizing Account type (commitment or liquid) Follow-up (months) Investment/ enterprise Income/ spending Smoothing
Dupas and Robinson Kenya 2006–08 67 Individual C 6 + + +?
Brune, Giné, Goldberg, and Yang Malawi 2009–10 6 Group C, L 16 + +
Abraham, Kast, and Pomeranz Chile 2008–09 90? Group L 12 +

I note these patterns:

  • Except in Manila, wherever the impacts of microcredit on microenterprise (investment, profits, new business starts) were examined, they were positive. By and large, microcredit and microsavings do stimulate microenterprise. Of course the stimulus is statistical, not an iron rule. Not everyone who uses these financial services opens or expands a business.
  • There is hardly a sign that microcredit affects poverty. In Mongolia, those offered group microcredit (but not individual microcredit) spent more on food. In Bosnia and Herzegovina, those offered individual microcredit spent less. That's about it.
  • But most of the studies look at impacts over 12--18 months. THis leaves open the possibility that microcredit has bigger benefits only over the longer term.
  • Not evident in the tables is that all of the lending programs examined have been for-profit (I believe), except EKI in Bosnia and Herzegovina.
  • None of the microcredit studies has looked at the impact of combining credit with other services, such as classes in nutrition or accounting.
  • Like microcredit, microsavings stimulates investment in business activities, at least when in the form of a commitment account, one that makes it expensive or impossible to withdraw money before some specified date. This is particularly interesting because loans too can also be viewed a commitment device. Once you borrow the money, you are under a strong compulsion to set aside money for those payments, which is a kind of obligatory saving. Both commitment devices are stimulating investment.
  • But even within the short periods of these studies, savings is measurably boosting income and spending. This raises the question of why credit has not shown similarly rapid and positive impacts, and makes me a bit pessimistic that following up after a couple more years (as is being done in Hyderabad) will change the picture.
  • Finally, more with savings than with credit, there are hints that savings helps people sustain spending during important events such as serious illness or the birth of a child. This is just as you might expect. In Kenya, Dupas and Robinson found that in households offered savings accounts, spending fell less when someone in the family got malaria; but the effect wasn't very significant statistically, which is probably why it has been dropped from the latest draft. The paper on Chile---preliminarily---finds something similar for a completely liquid account, one allowing deposits and withdrawals at any time.

A puzzle emerges. If, as Stuart Rutherford has long emphasized, savings accounts and loans are more similar and interchangeable than they might seem (being ways to assemble usefully large lump sums), and if commitment savings accounts are particularly like loans, why are the two producing markedly different impacts on poverty even within a year? An answer to that might lead to ways to make loans more useful to the poor. Perhaps the key, for example, is the greater flexibility of savings accounts. Even commitment accounts let you decide when to deposit. This would point to the value of flexible lines of credit, the most prominent example today being the Grameen Bank's top-up loans.

To me, the emergence of such patterns, and the practical questions they generate for future research, demonstrate the value of this new, rigorous wave of research. I look forward to more.

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CGD blog posts reflect the views of the authors, drawing on prior research and experience in their areas of expertise. CGD is a nonpartisan, independent organization and does not take institutional positions.