And if the tariff is set too high domestic goods will become more expensive as well as there'd be no reason for a domestic manufacturer to charge substantially less than the price of the imported goods.

Two domestic manufacturers compete to get more customers by reducing prices, price trends to cost.

All tarrifs do is remove foreign competition who have lower costs for a variety of reasons, some which benefit the country imposing the tariff, some not.

Neoliberal approach is to always require the cheapest goods, no matter the cost. That’s not the only approach.