I get your reasoning and some could even be sympathetic to your point of view (up to a point), but a few brief moments of consideration will certainly serve to

I get your reasoning and some could even be sympathetic to your point of view (up to a point), but a few brief moments of consideration will certainly serve to illustrate that what you are advocating is totally impractical. How does one define (let alone implement) the denial in participation in the domestic market? Do you mean that companies with foreign shareholders can no longer trade? Do you mean that the opinions of foreign nationals can no longer be aired and/or commented? Do you mean that foreigners cannot be employed by organisations that participate in the economy? Do you mean that foreigners can no longer purchase from or sell to national firms?