$18 on Frictional Games Store and only $16 on STEAM

[Temar]

Can you elaborate on that? I'm curious on how this works.

I doubt they are allowed to.

Well, I don't want to know the specifics of their deal with Steam - just the basic method how Steam works. There are only three possibilites, perhaps they can point out which one it is:

1) Steam buys copies like a retail store.

2) Steam buys copies on demand but only pays n% of the original price. If they'd pay i.e. 60% of the retail price they had a margin of 40% for discounts.

3) Steam works like ebay where publishers set the prices and discounts. (Not very likely after what Jens wrote already)

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Steam is the publisher. The publisher sets the price. They could give it away for free if they wanted to.

I highly doubt that, but let's add it as a fourth possibility.