President Donald Trump’s trade war with China could cost the average American family of four up to $2,300 a year, according to a report on the effect of tariffs on the U.S. economy and workers. The study, by the economic consulting firm Trade Partnership Worldwide, assesses how tariffs will affect American consumers and the economy. According to the report, an average American family of four would pay $2,300 more in goods and services each year if Trump imposes a 25% tariff on all goods from China, as he has repeatedly threatened. If tariff levels remain where they are today, the...