policies there's there's a small part of the paper that says something on slightly more complex policies but it's actually it is actually a little bit harder to deal with sort of arbitrary dynamic pricing policies and come up with exactly the same conclusions so what we do is we focus on threshold policies and and these are very natural because they match exactly with what's done in practice which is basically that I have a threshold and then if the number of available drivers drops below that threshold I set a multiplier that's a high