Momi  Dahan and Strawczynski, Michel . 2000. ?Optimal Income Taxation: An Example With A U-Shaped Pattern Of Optimal Marginal Tax Rates: Comment?. The American Economic Review, 90, 3, Pp. 681-686. http://search.ebscohost.com/login.aspx?direct=true&db=edsjsr&AN=edsjsr.117350&lang=he&site=eds-live.