How effectively do state governments use the principles of sound taxation? Choose three sources of state revenue, describe them, and analyze whether they fit into Adam Smith's principles of sound taxation.

There is four main principles in Adam Smith's principles of sound taxation: (1) Equality, (2) Certainty, (3) Convenience and (4) Economy. So far, the state governments use the principles of sound taxation as a basis of the laws that they pass and implement regarding taxation.