"The ticket scalpers" happen when prices of tickets are too low. So either price discovery of the correct price is too risky/costly or the seller wants to subsi

"The ticket scalpers" happen when prices of tickets are too low. So either price discovery of the correct price is too risky/costly or the seller wants to subsidize the buyer for some other reason. This isn't even dependent on the EMH - if there is no price theory at all, then... So Uber et al could actually be "ticket scalpers" and there's only a deeply normative reason - not a rational one backed by economic theory - to decry them. Of course this illustrates a .... nice example of shear between complex social arrangements and the (ab)use of mathematics. Taxi medallions are a textbook example of rents. A business model that goes after rents almost cannot be "evil. Of course if it's your ox being gored... "Sharing" is Just One Of Those Words - like "nice" or "fair".