From a market perspective and my years of consulting and auditing several publicly traded companies tax changes never hand an effect. It really hit home when one of my clients had a $50M increase to cash flow as a result of change in tax outcome, the market result on earnings.....nothing. Another of my clients had a global tax rate (cash) of 2.5%, the market didn't appreciate the brilliance of their corporate structure. While there is much speculation in the market, there is a lot of it driven by fundamentals. Gross margin, and cash flow from their business fundamentals.