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group dynamics

Social Impact Evaluation in Interconnected Evolving Systems

Posted on July 18, 2010 by Tara Thiagarajan in Blog, Microfinance, Writing. 1 Comment

Today there are many development economists that focus on social impact evaluation studies. These studies typically compare groups receiving an intervention to groups that did not. For example, did the group that received microfinance do better than the group that did not? Although they attempt to ‘control’ for variability between groups, I see some fundamental flaws in this approach. First, to be meaningful comparison, a ‘control’ group must be independent of the intervention group. In society, which by definition is an interconnected system, this is virtually impossible and you can never control this way for network effects.

For example, lets say the people who received microfinance in the village used the money to buy goods from the people who didn’t. Its not impossible that this could result in the ‘control group’ getting richer because they could sell more. Compared to them, … Read More »