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I have to say that I'm a bit confused by the Elemental Market. I fail to see what filling it triggers in the mechanics of the game. Am I missing something obvious?

It just tracks how many points you get for your element rooms when you cap a tower, and at the end of the game. 

Does that answer your question?

What happens if you do fill out a element? Is it worth -2? or 0?

It's worth -2