And if it is not free and open?
We can answer from recent history - and it makes common sense. When it's not free and open, what you have are protected industries. So to protect a few thousand US Steel union workers under W Bush, there was a huge tariff slapped on foreign steel. What happened is hundreds of thousands of construction jobs and auto making jobs and other jobs went away, because with steel artificially inflated by 40% - far less steel was bought and far less things were made with steel and far less jobs resulted. This is common sense, what we all know from supply and demand. Prices go up, purchases go down.