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The number of experimental units n is often limited due to budget constraints, to capacity constraints of the implementing organization, or naturally limited by the number of villages eligible for a program or number of people or firms that apply. Here are some of my main thoughts/tips on approaches to try in order to improve statistical power.
Matched pair randomizations can help in increasing balance in experiments with small samples. But several reasons suggest the need for caution, and that matched quadruplets may be preferable in some cases.