the key idea i want to get across is that the tactic should be to put steep export taxes on the "giffen goods" that are perfectly or nearly perfectly inelastic in the american market (uranium, some other minerals, electricity and oil) and use the revenue to socialize the losses. that would actually be a productive retaliation, in that it would transfer the cost to american capital. tariffs on american goods in canada might help some local producers, but it doesn't generate the revenue streams the government needs to socialize the losses.