Group 1 - The article argues that extreme tariff measures by the U.S. will ultimately harm both the U.S. and its trading partners, as supported by historical and empirical evidence [1][7] - Historical economists, from Bastiat to List, have emphasized the importance of moderate tariffs and free trade for economic development, indicating that excessive tariffs can weaken domestic production capacity [1][2] - A study by French economist Philippe Aghion and others found that tariffs do not correlate positively with total factor productivity, while fiscal subsidies and tax incentives do [2][3] Group 2 - The article highlights that prior to joining the WTO, high tariffs on imported cars did not lead to a strong domestic automotive industry in China, demonstrating that tariff protection does not foster industrial progress [3][4] - Post-WTO accession, China has gradually reduced its average tariff rate to 7.3% by 2023, indicating a shift towards lower trade barriers [4] - The development of industries in Shenzhen, such as mobile phones and renewable energy vehicles, is attributed to market competition rather than tariff protection [5][6]

Core Viewpoint - The article argues that extreme tariff measures employed by the U.S. since April 2023 will ultimately harm both the U.S. and its trading partners, contradicting historical and empirical evidence supporting free trade [1][2]. Group 1: Historical Context and Economic Theory - The article references the "ineffective railway theory" proposed by French economist Frédéric Bastiat, which illustrates that tariffs can negate the benefits of reduced trade costs [1]. - German economist Friedrich List emphasized the need for moderate tariffs to avoid harming domestic production capacity and tax revenue [1]. - The consensus among economists from Adam Smith to Paul Krugman highlights the importance of free trade for global economic development [1]. Group 2: Empirical Evidence - A study by Harvard professor Philippe Aghion and others analyzed data from 1.06 million Chinese enterprises from 1998 to 2007, concluding that fiscal subsidies and tax incentives positively correlate with total factor productivity, while tariffs do not [1][2]. - The article cites China's experience before and after joining the WTO, where high tariffs did not strengthen the domestic automotive industry, while subsequent tariff reductions led to growth in various sectors through market competition [2]. Group 3: Economic Implications - Warren Buffett's assertion that tariffs on imports will ultimately translate into domestic taxes suggests that such measures are contractionary and detrimental to economic growth [2]. - The article concludes that the U.S. government's tariff strategies will not yield positive outcomes for the economy or industry progress, reinforcing the idea that protectionist policies are counterproductive [2].