State X's premium tax rate is 2 percent. State Y's premium tax rate is 3 percent. State X insurers are required to pay the 3 percent rate on business written in State Y. State X requires insurers from State Y to pay a 3 percent premium tax on business written in State X, even though the premium tax rate is only 2 percent in State X. This practice is known as a: Risk-based capital requirement Retaliatory tax law Tax tariff Guaranty fund assessment