Common markets (Little Upsilon)

Is there a good on-line tutorial for how common markets work in this game? They do not work how I expected - they are no help for onetime random purchases or sales it seems.

If a corporation wants to deal with the common market, does it really have to contract its entire output that way? I have tons of corporations where I want about half their production, and thought the common market would be a good way to farm out the rest. Likewise I have a bunch of items I need just a little bit of each month, but it seems I have to buy more than I want.

Am I seeing this right? And what in the real world are these restrictions trying to simulate? It seems really odd.

Common markets do not do anything accept increase your score. Common markets are like clubs. You join this club(common market) and trade between the members. Any trading outside that common market is considered international trading. The game likes these "clubs" and gives you points on your game score when you participate in common markets, but overall it is no big help in any other area. You will find some Federations have a common markets or country neighbors and empires.

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