evidence: There’s wide agreement that the tariff would affect consumers. "Trump's proposal would be very harmful to household budgets," said Daniel Mitchell, an independent libertarian economist. [...] Previously, a Republican National Committee spokesperson pointed PolitiFact to a study by Coalition for a Prosperous America, a group of manufacturers and labor unions that generally supports higher tariffs. The study says a 10% tariff "would stimulate domestic production and raise economic growth to produce a 5.7% increase in real income for the average American household." The proposed tariff policy changes’ possible effect on middle-income consumers varies widely depending on the study. (It would also vary based on a family’s economic circumstances.)