Ron,

According to Wikipedia, "It is believed by some philosophers (notably A. C. Grayling) that a good rationale must be independent of emotions, personal feelings or any kind of instincts. Any process of evaluation or analysis, that may be called rational, is expected to be highly objective, logical and "mechanical". If these minimum requirements are not satisfied i.e. if a person has been, even slightly, influenced by personal emotions, feelings, instincts or culturally specific, moral codes and norms, then the analysis may be termed irrational, due to the injection of subjective bias."

So... decisions cannot be made rationally since context matters and above all the neuroscience research implies that we cannot make decisions without our emotions. Montier refers to this as the "human condition." I like to say that we are neither rationale nor irrational, but simply human.

Cheers.