Det optimala priset är minus noll

And indeed the optimal price is not zero, in fact the optimal price is negative. Bloggers\nhave such a strong incentive to have their writings read that they\nwould really like to pay their readers. But for various reasons they\ncan't and so the best they can do is set the price as low as possible. \nThat is, as it often happens, the explanation for the unlikely bunching\nof prices at the same point is that we are all banging up against a\nbinding constraint.