| Article ID: | iaor2005782 |
| Country: | China |
| Volume: | 33 |
| Issue: | 7 |
| Start Page Number: | 65 |
| End Page Number: | 71 |
| Publication Date: | Jul 2003 |
| Journal: | Mathematics in Practice and Theory |
| Authors: | Han Song |
Banker studied returns to scale using DEA; now more and more researchers are doing this. There are two main approaches: DEA input model and DEA output model. The models, conditions and conclusion of these approaches are different. This paper gives sufficient and necessary conditions for returns to scale in DEA.