A "little wobble" may not change it more than a "little", but enough "little wobbles" over time become a "big wobble" that may change it in a "big" way. The right question to ask is: what's the elasticity? So far the elasticity of domestic migration to tax increases has been smaller than many expected due to network effects and inertia, but nevertheless if you look at the population growth rates of high tax states like CA and NY and compare it to low tax states like FL and TX, you will definitely see a pattern. Rational people think on the margin. Perhaps only a few people will move if you increase tax rates by 0.1%, but more on average will decide to move than if you hadn't raised taxes - the question really is, how many?