| Article ID: | iaor20084155 |
| Country: | Netherlands |
| Volume: | 35 |
| Issue: | 6 |
| Start Page Number: | 782 |
| End Page Number: | 790 |
| Publication Date: | Nov 2007 |
| Journal: | Operations Research Letters |
| Authors: | Fliege Jrg |
Suppose that an additional objective function is introduced into a (multicriteria or singlecriterion) optimisation problem. The following questions are considered: How does the set of (properly, weakly, or strictly) efficient points change when instead of the old problem the new problem is considered? What happens in the value space?