Trade barriers

FILE - This Monday, Aug. 24, 2015, file photo shows the New York Stock Exchange. U.S. stocks are mixed, Tuesday, Jan. 23, 2018, as technology and consumer-focused companies rise but consumer goods makers like Johnson & Johnson take losses. (AP Photo/Seth Wenig, File)

Special police is on guard on the opening day of the 48th annual meeting of the World Economic Forum, WEF, in Davos, Switzerland, Tuesday, Jan. 23, 2018. (Gian Ehrenzeller/Keystone via AP)

FILE- This April 20, 2011, file photo shows some of the 30,000 solar panels that make up the Public Service Company of New Mexico's new 2-megawatt photovoltaic array in Albuquerque, N.M. Some in the U.S. solar-power industry are hoping a decision this week by President Donald Trump doesn’t bring on an eclipse. Companies that install solar-power systems for homeowners and utilities are bracing for Trump’s call on whether to slap tariffs on imported panels. The solar business in the U.S. has boomed in recent years, driven by falling prices for panels, thanks in part to cheap imports. That has made solar power more competitive with electricity generated from coal and natural gas. (AP Photo/Susan Montoya Bryan,File)

United States Secretary of State Rex Tillerson speaks with South Korean Foreign Minister Kang Kyung-wha during a meeting on North Korea in Vancouver, British Columbia, Tuesday, Jan. 16, 2018. Officials are discussing sanctions, preventing the spread of weapons and diplomatic options. (Jonathan Hayward/The Canadian Press via AP)

In this Sept. 11, 2017, photo, a truck heads toward the North Korean side of the Friendship Bridge linking China and North Korea, as seen from Dandong in northeastern China's Liaoning Province. China reports its trade with North Korean shrank 50 percent in December 2017 from a year earlier as governments tightened sanctions imposed over Pyongyang's nuclear and missile development. (Chinatopix via AP)

Britain's Chancellor of the Exchequer Philip Hammond arrives to attend a cabinet meeting at 10 Downing Street, the first following a reshuffle by Prime Minister Theresa May, in London, Tuesday, Jan. 9, 2018. (AP Photo/Alastair Grant)

Matthew Rycroft, left, Britain's Ambassador to the U.N. and U.S. Ambassador Nikki Haley vote in favor of a resolution, Friday, Dec. 22, 2017, at United Nations headquarters. The council is voting on proposed new sanctions against North Korea, including sharply lower limits on its refined oil imports, the return home of all North Koreans working overseas within 12 months, and a crackdown on the country's shipping. (AP Photo/Mark Lennihan)

Workers collect wooden planks for recycling outside an exhibition center in Beijing, China, Wednesday, Dec. 20, 2017. Chinese leaders have promised to increase imports and reduce risks in their financial system following an annual planning meeting amid slowing economic growth and pressure from trading partners to open their markets wider. (AP Photo/Ng Han Guan)