Nope. Not at all. Let’s say you have a Chinese company that makes cheap Chinese toys. Each toy costs about $1 to make but is priced $5 for retail. If a 25% tariff is added, the Chinese company would still want their cheap Chinese toys to be cheaper than American toys, so they would just let the tariff eat into their profit margin.
Companies don't look at marginal unit costs or cost of revenue when it comes to assessing the impact of a new tax. They look at divisional operating costs or possibly the entire company's bottom line. When you factor in asset depreciation, R&D, fixed costs, and other overhead, that good that "costs you $1 to make and is sold for $5" isn't making you 400% profit margins; it's making 7.5% profit margins. So a 25% tax means either you raise prices or find a new supplier. That's what happens in the real world.
Right now, in real life, but with fake numbers, I have a production system that costs me $5 an hour to operate. I rent it out for $12 an hour. WAOW, that's 240% profit, says the retard. WAOW, I can tax you at 25% , and you won't change anything, says the moron.
Except the system itself cost $200,000. This is not paid for out of magic elf money. It's paid for out of that rent I'm collecting. Eventually. So to make rational plans, I have to model that as an hourly cost. 5 year depreciation, 8760 hours in a year, so that comes to 200,000 / (8760 x 5) = $4.56. So now my costs are $9.56. That 240% profit margin just got cut to 25%. We've got support staff for this thing, as well as salesmen making commission, and we can't rent it 24 hours a day, 365 days ayear, so at the end of the day, our profit ends up being around 84 cents per hour rented, or 7%.
Slap a 25% tax on me, and now I'm losing money. I will in fact raise prices to stay profitable, and I'll be raising them about the entire amount of the tax.