Most countries put in place trade barriers to facilitate the sale of their products abroad or within the country, and many economic and political developments can contribute to countries prioritizing security, policy or domestic industry over free trade. But these trade barriers almost always have unintended consequences and do not always achieve their goals. Our results are strong for a sample of interviewees only in India or a sample that excludes respondents in India, which controls trade unions, political ideology and public spending and excludes people with prior awareness of social norms. Historically, openness to free trade increased considerably between 1815 and the beginning of the First World War. In the 1920s, trade opening resumed, but collapsed during the Great Depression (especially in Europe and North America). Trade openings increased again sharply from the 1950s on (albeit with a slowdown during the oil crisis of the 1970s). Economists and economic historians say the current level of openness to trade is the highest they have ever been.    Milner, H., Mansfield, E. D.
(2012). The votes, vetoes and political economy of international trade agreements. Princeton: Princeton University Press. Two simple ways to understand the proposed benefits of free trade are by David Ricardo`s theory of comparative advantage and by analyzing the impact of a tariff or import quota. An economic analysis of the law on supply and demand and the economic impact of a tax can be used to highlight the theoretical pros and cons of free trade.   Finally, trade will always be more chaotic than the open path that the WTO is supposed to protect, but as globalization increasingly brings markets closer together, each country will have to face the effects of free trade and the obstacles that are opening up there. Bastiaens, I., Postnikov, E. (2017). Greening up: the impact of environmental standards in EU-US trade agreements. Environmental policy., 26 (5), 847-869. Kucik, J.
(2012). The internal policy of the institutional organisation: the preferences of producers with regard to the rules of trade agreements. Economy and politics, 24 (2), 95-118. In the modern world, free trade policy is often implemented by a formal and reciprocal agreement between the nations concerned. However, a free trade policy may simply be the absence of trade restrictions. A free trade world brings net benefits to all concerned. But this world doesn`t really exist – countries impose free trade bans for a number of reasons. Many supporters of economic nationalism and the school of mercantilism have long presented free trade as a form of colonialism or imperialism. In the 19th century, such groups criticized British demands for free trade as cover for the British Empire, particularly in the works of the American Henry Clay, architect of the American system and the German-American economist Friedrich List (1789-1846).  “that the influence of education on voters` views on trade and globalization is more related to exposure to economic ideas and information on the aggregated and varied effects of these economic phenomena than with individual calculations on the impact of trade on personal income or job security.