Abstract:
The purpose of this research was to study the efficiency of 64 microfinance institutions (MFIs) in the Provinces Cluster Number 12 of Thailand. Data were analyzed by Data Envelopment Analysis: DEA, under Constant Return to Scale. The result showed that all types of MFIs had higher efficiency scores. Mega-sized MFIs had higher efficiency scores of 30.43%, Large-sized MFIs had higher efficiency scores of 36.36%, and Medium-sized MFIs had higher efficiency scores of 50%, The average efficiency scores under Constant Return to Scale was 0.7511, under Variable Return to Scale. The result showed that all types of MFIs had higher efficiency scores. Mega-sized MFIs had higher efficiency scores of 43.48%, Large-sized MFIs had higher efficiency scores of 39.39%, and Medium-sized MFIs had higher efficiency scores of 75%, The average efficiency scores under Variable Return to Scale was 0.7511. The findings also showed that 48 MFIs had Decreasing Return to Scale : DRS. This implied that outputs increase by less than proportional change in inputs.