Individual states can't tax interstate commerce, that's the job of the feds. Actually, they can if they have a presence in both states - they can only tax a bus

Individual states can't tax interstate commerce, that's the job of the feds. Actually, they can if they have a presence in both states - they can only tax a business that has a physical presence in that state. It isn't broken, it is part of the [inferred] Constitution. The idea is to not place burdens on interstate commerce. Without it the states would be free to give their state preference in commerce - to tax commerce interstate at a high rate so nobody wants to engage in interstate commerce. http://en.wikipedia.org/wiki/Dormant_Commerce_Clause http://en.wikipedia.org/wiki/Dormant_Commerce_Clause "The central rationale for the rule against discrimination is to prohibit state or municipal laws whose object is local economic protectionism, laws that would excite those jealousies and retaliatory measures the Constitution was designed to prevent"