Use a supply and demand diagram to show the effects of the US tariff on imported steel.
The tariff has the effect of shifting the world supply curve vertically. This will create a redistribution of surplus within the graph. We see that consumer surplus will decrease which is a net loss. Furthermore this makes consumers unambiguously worse off than under a free trade regime, but still better of than under a system without trade. The producer surplus has increased, as they are now receiving an extra amount per sale and with this increase in the price level, ...