In 2015, several U.S. paper manufacturers asked the federal government to impose tariffs on paper imported from China, Indonesia, Brazil, Portugal, and Australia. According to an article in the Wall Street Journal, firms in these countries were accused of "dumping certain types of uncoated paper on the U.S. market, including that used for such things as computer printers, book publishing, junk mail and envelopes." What is "dumping"? If the U.S. firms succeed in having tariffs imposed on imports of paper, briefly explain who will gain and who will lose.