Tariff
A tariff is called an optimal tariff if it's set to maximize the welfare of the country imposing the tariff. It is a tariff derived by the intersection between the "trade indifference curve" of that country and the offer curve of another country. In this case, the welfare of the other country grows worse simultaneously, thus the policy is a kind of "beggar thy neighbor policy". If the offer curve of the other country is a line through the origin point, the original country is in the "condition of a small country", so any tariff worsens the welfare of the original country.
Henry George
George was opposed to tariffs, which were at the time both the major method of protectionist trade policy and an important source of federal revenue, the federal income tax having not yet been introduced. He argued that tariffs kept prices high for consumers, while failing to produce any increase in overall wages. He also believed that tariffs protected monopolistic companies from competition, thus augmenting their power. Free trade became a major issue in federal politics and his book "Protection or Free Trade" was the first book to be read entirely into the Congressional Record. It was read by five Democratic congressmen.