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We revisit a randomized experiment that demonstrated the cost-effectiveness of group-based, compared to individual, consulting services for firms in the Colombian auto parts industry using administrative data that now permits following firms for up to a decade. Firms in the group consulting intervention are more likely to survive, have higher employment, and have increased sales and profits by approximately 50%. This longer-term growth appears to in part come through increased exporting, as well as persistent management improvements. Case studies offer insights into underlying mechanisms. The more expensive individual consulting has noisy long-term impacts that are much less cost-effective.
