First Review What I do understand,
The demand and supply chart shows once imports are allowed...
Tariff is added on imports resulting in loss of consumer surplus and increase in supplier surplus.
I get everything up until to this point. However...
Is this wrong? But this traditional textbook version. Green represents both, width represents imported quantity and area represents govt surplus. This is not what happens in real life. If there are two products both priced $10, I'd buy either one all things being equal regardless of what company or country it was made in. For most products I'm not going to care whether they were imported or domestically made. YET, this graph very clearly assumes import will stop where local suppliers are able to provide.
Correct version should be like this:
or maybe like this: