Pioneering and Market Share: Is Entry Time Endogenous and does it Matter?

All previous empirical work assessing the effects of pioneering on firm performance treats pioneering as an exogenous variable. The authors develop a theoretical model of the entry decision that suggests treatment of pioneering as an endogenous variable. They test the model by reestimating a recent empirical pioneering model. Using Hausman's specification test, they find statistically significant bias in the exogenous pioneering model. In assessing the effect of pioneering on market share, they find substantive differences between the biased and inconsistent exogenous pioneering estimates and the consistent endogenous estimates in terms of both statistical and practical significance.