It strikes me that there might two different answers to those two different problems.
On the ability for Amazon to increase fees, my colleague, Mr. Généreux, would say, as he just said, can sellers not go elsewhere? It's not so easy given the concentration of the market and where the consumers happen to be.
The intuitive response.... I think the “Amazon's Toll Road” report suggests one solution would be to cap fees. The other solution is a more systemic one, which is breaking up Amazon, which doesn't strike me as something a Canadian regulator can put on the table.
Is there anything useful for us to look at as far as solutions go with respect to the imposition of fees on suppliers in the case of a monopoly or oligopoly?