Literature on the subject of the income tax has become so vast that to add something worthwhile to it seems almost a hopeless task. Men who have come authorities through years of reading and study in the field on taxation have set forth their views at length; commissions appointed by states and nations have made investigations and reported their findings, both as to the theory of the tax and its application; every fiscal report of the many nations and several states employing this form of levy is, in part, a document dealing with it. Supplementing these sources of materials are summaries of them, to be found in nearly every book of Economics or Public Finance, and partisan arguments for or against the tax are numerous and easy to find. In v...