Path Dependence and the Quest for Historical Economics: One More Chorus of the Ballad of Qwerty

The term path dependence (PD) here refers to a dynamic property of allocative processes, pertaining to non-ergodic stochastic systems -those whose asymptotic distributions evolve as a function of the history of the process itself. PD is shown to be neither necessary nor sufficient for the existence of ‘market failure’, although the two properties may arise from common structural features. A variety of stochastic models are PD and yet exhibit diverse properties in regard to predictability and ‘lock-in.’ The taxonomy of path dependence proposed by S. J. Liebowitz and S. E. Margolis (1995), along with the latter’s interpretation of ‘lock-in’ and ‘accidents of history’ are shown at best to be of limited usefulness in the study historical phenomena, and misleading as to the possible implications of PD for economic policy analysis.