We will probably end up arguing about definitions here, but I think that the hackney cab isn't a commodity because it's highly regulated and managed for both su

We will probably end up arguing about definitions here, but I think that the hackney cab isn't a commodity because it's highly regulated and managed for both supply and quality. Yes - it's an interchangeable item (so you win on the semantics) but it can't be glutted out or somehow produced more cheaply.