It's not just the app that makes Uber, Lyft, Grab extra better than cabs. It's that unlike cabs they can scale with demand. Cabs can't have enough drivers and c

It's not just the app that makes Uber, Lyft, Grab extra better than cabs. It's that unlike cabs they can scale with demand. Cabs can't have enough drivers and cars to cover peak demand or they'd run out of money from expenses. Those others can as when there is peak demand more drivers will volunteer to work.