However, Google claims it is not doing this:
> As part of the change, Google said it would operate its shopping-ad service as if it were a profitable, standalone business to ensure doesn’t overbid for ads.
Still, “profitable” could be by the slimmest of margins, and Google would still have a strong incentive to keep the “standalone” business going (that is, the profit to their other business), whereas an independent company wouldn’t.
So the ability to pay yourself unlimited money guarantees a market dominant spot where competition is drastically diminished.
It also strongly affects Google's search incentives, making them prioritize advertising and create inventory where there was none, dying up organic trafic. This is something a profit oriented enterprise would tend to do anyway to maximize revenue, but it's a far cry from Google's original neutrality aspirations.
If Google is the only one who can extract V (likely the case, since they are the ones consuming the spots), they are reaping the benefits of that fact, not of being able to sell to themselves.
I don't think this is quite right. If I have a fixed quantity to sell (approximately true for advertising space on the web) then units I buy from myself cost me the same as they would cost other companies.
Suppose I have $100, and 5 advertising spots worth $20 each. I have two options here:
a) If I sell the spots to others then I have $100 + 5 * $20 = $200.
b) If I "sell" the spots to myself (the other wing of my company that needs to advertise) I have $100 and whatever 5 advertising spots are worth.
You are representing the situation of b as if it were "free advertising", thus giving my company an unfair advantage. But in fact, compared with situation a, it is clear I paid for the advertising, as I am up 5 spots and down $100 I could have obtained by selling the spots. So advertising's cost is not lower just because I also own the company that sells the advertising spots. If I'm better off than someone without advertising spots that's because advertising spots are worth something, not because of any purported shady synergy I get from owning both the advertising spots and the company that needs them.