Just taxation system can make you richer without fleecing the poor

Is it true that if we reverted to progressive taxation under Article 3 of the Constitution, this could fetch the Government more than thrice as much as it is collecting through regressive taxation? Read what experts have said on this. Please read In search of a new tax model? by Huzaima Bukhari and Dr Ikramul Haq in the News on Sunday http://www.jang.com.pk/thenews/jun2010-weekly/nos-06-06-2010/pol1.htm#2