TY - JOUR T1 - Note on Rationality JF - The Journal of Investing SP - 69 LP - 76 DO - 10.3905/joi.2017.26.2.069 VL - 26 IS - 2 AU - Joseph Calandro, Jr Y1 - 2017/05/31 UR - https://pm-research.com/content/26/2/69.abstract N2 - Rationality is a term that comes up often during investment conversations, and yet it has not been definitively defined. For example, economists and investors each use and define the term differently. The objective of this note is to profile three general definitions of rationality and demonstrate how one of these definitions is practically applicable to investment management. This is demonstrated first via historical profiles of two executive managers who publicly declared their intention to create shareholder value. Such declarations are often made, but not all executive managers follow through; for those who do, there is wide variation in the effectiveness of value creation, especially over time. Therefore, insight into when such declarations have a higher probability of being realized could help to practically inform investment analyses. Given the profile nature of this note, it is not our intention to thoroughly survey or examine the intricacies of either the concept of rationality or executive management in general. Rather, our intention is to introduce the concept of rationality from an investment perspective and to practically profile its usefulness. Toward this end, the article closes with suggestions on how to supplement traditional forms of investment analysis with rationality-based/inspired input.TOPICS: Portfolio theory, portfolio construction ER -