Until january 1, 2012, the price for ethanol consumers in the united states was higher than world free-market price by $0.54 per gallon because of the $0.54 per gallon tariff imposed by the u. s. government on ethanol imports. this is an example of a(n) tariff.

Specific tariff

Explanation: The fixed charge levied on the imported goods on the basis of the units actually imported is called specific tariff. This is a form of tax and is used by the government of the importing country to regulate and control the trading and usage of that good.

In the given case, United states govt. imposed tax on ethanol which results in increase in its price in America. The increase in price will further result in decrease in demand. Also it was imposed on the basis of gallons imported.

  Hence from the above we can conclude that the given case is an example of specific tariff.