Universal Argument against free trade, fair trade, capitalism, socialism, libertarianism . . .
. . . populism, or against any other "ism" you can imagine.
Artificially driving up wages or any other price makes people worse off overall, . . .
You still haven't addressed the issue that all too often what you portray as "free" trade is nothing of the sort at the level of the workers.
When the workers are free to deal with a range of non-colluding companies and regulation . . .
There will always be some amount of collusion among companies. It's impossible to prevent one company from communicating with another. There's also collusion between independent contractors. Like a shoeshiner at 8th and Broadway getting together with another shoeshiner at 6th and Broadway and setting their prices. This can be made illegal, sort of, but good luck trying to enforce it! It's impossible to eliminate all collusion.
. . . and regulation adequately addresses externalities then free trade is certainly the best.
But not until all collusion and all externalities are addressed by perfect regulations which eliminate every evil? So until we have that perfect system of regulations eliminating all imaginable evil, there's no free trade?
But regulation will never be totally adequate. So trade has to be prohibited? or free trade is disproved? What is the point? Something in the world is not exactly perfect, so therefore every idea about making the world better is refuted?
You can always argue that something cannot be done until every evil is first eliminated. You could say there can be no democracy, no justice, no free speech, no free press, no human rights, etc., because there is collusion going on somewhere, and other evils, and unless all the evils are first eliminated, no system for doing things can ever work, or be right.
But then, what's the default position? We also can't have "fair trade" if there are evils in the world. Nothing anyone proposes is possible unless first all the evils are eliminated. So the default position is always what? the status quo? Whatever system or non-system is happening currently has to remain in place, with no change allowed, because no proposed change can ever work unless first the world is made perfect, with no evils happening anywhere?
Some say the free market can't exist as long as we have giant corporations dominating the market.
Ayn Rand said there has never really been free enterprise anywhere. Marxists say there has never been any true Socialist system tried anywhere.
So, the universal argument against changing anything to make the world better is: We can't have it until first we have a perfect world for it to operate in. So first make the world perfect, eliminating all the evils, and only then can we have -- Free Trade, or Fair Trade, or Free Enterprise, or Communism, or Capitalism, or Socialism, or Democracy, or Liberty, or ---- whatever -- whatever system you want, it isn't possible until first we create a perfect world for it.
So, every demand for change, or every claim that something should be done differently is automatically wrong -- until first a perfect world happens in which there are no evils of any kind, e.g., such as no collusion anywhere. Only then can we entertain any suggestion for change.
It's just as true that ideally there can be no "fair trade" unless all collusion is eliminated.