The government has said that it intends to raise the pension age if life expectancy keeps increasing, so the sky could be the limit in theory!

BBC: Fergus Muirhead

In theory, a discretionary central bank could limit the quantity of money and achieve long-run price stability by controlling the growth of nominal final demand.

FORBES: The Federal Reserve's Flawed Approach To Monetary Policy

Another theory is that Apple may have reached a theoretical limit to how many products can be produced in a specific window of time.

WSJ: New iPhone Sellout Tests Apple Supply

Secondly, Paul says SideCar supports a limit on revenue per year for drivers, which will ensure that people are using the service as ridesharing and in theory are only using the money donated by riders in order to pay for car expenses, not to make a profit in a taxi-type service.

FORBES: SideCar Acquires Austin's HeyRide, Launches In Los Angeles, Austin, Philadelphia