Dr. Donal de Buitléir:

Ultimately, one must look at the evidence as best one can. One must obtain econometric evidence on the extent of the impact. For example, if one was to double the national minimum wage, it might have a major effect on employment; however, a graduated increase might have less of an impact. Ultimately, one considers the best evidence one can find, but it may come down to a matter of judgment. A principle that has guided me is that if I am not sure what to do, I think of what is correct in the circumstances. Evidence takes one part of the way and often a great deal further than one thinks, but it does not lead to the position where one can say with absolutely certainty, "This is the right answer;" it could be 10 cent either way. It is a judgment call and one does the best one can.