Hm... I think I would predict that it would depend on speed because querying prices reveals information, but not accepting also reveals information, so I would expect that it would go up initially due to an expected shortage, but then when it becomes clear that no one is accepting, it reverts to normal or lower, because that suggests low urgency or willingness-to-pay compared to what the models had forecast for that exact location & time, so they have to be offered lower prices to accept at all.

(This is the flipside of personalized pricing: it's also lower prices, as noted in some of the anecdotes, although he mostly emphasizes the potential for higher prices.)