The one way that people break out of the chicken and egg situation is by using the "Bowling pin strategy" (more info here http://edgehopper.com/ http://edgehopp

The one way that people break out of the chicken and egg situation is by using the "Bowling pin strategy" (more info here http://edgehopper.com/ http://edgehopper.com/). So you start with one niche and then scale out intelligently from there. Again, this is what Groupon did by starting in SF and then growing from there. Sorry I was unclear - all 5 of the ideas were meant to be implemented in specific locales then expanding. Is there a city in the world that has a lot of people taking cabs from the airport? Every airport that I frequent regularly has this problem: Boston, NYC (x3), SF and Toronto. I think this would not be useful in some of the developing countries. I'd be willing to bet this would be useful for any airport where 1) there is a significant metropolitan core in a small constrained geographic area and 2) Where labor costs are high enough that the majority of the cost of the cab comes from driver wages/compensation. Actually, now that I think about it. Any "route" where a sufficiently large number of people would regularly be paying a substantial cab fare would almost certainly have an alternative means of transportation. Whether this be public transportation, shuttle services, etc. More often than not I think you'd find that society at large has already implemented your taxi sharing. Agreed but every mode of transport has a cost/convenience tradeoff. Public transit is generally cheap but takes some time. Single occupancy cabs are at the other end of the spectrum. And if you plotted every mode I don't believe the curve would be linear. Take for example shuttle services that are common in the US, specifically one from Boston airport to MIT. They typically serve ~8 passengers and cost roughly $20/person in my experience. This is fairly expensive relative to a cab that shares a ~$35 cab ride even among just two people. At $17.5/person it is much much faster to get to your destination in this method. There seems to be a sweet spot served by shared taxis specifically. The above is just for airports - another environment where this may work is in dense urban environments for short trips. I'm picturing going crosstown in Manhattan. For it to be useful, there would need to be sufficiently large number of users such that matching friction would be low enough that it didn't impact already low travel distances. Though your idea has given me another idea. An app that lets taxi drivers schedule with individuals directly. How many times do you take a taxi where the driver will give you their card and say "Give me a call if you want a ride?" Well, if you have an app that connects drivers with riders in an easy fashion, then you can get into a situation where everybody's incentives are aligned. You can get the driver to give the rider a discount, the driver does this for guaranteed income, the rider does it for the discount, and you do it because you get a small cut. You can then expand into a "group ride" policy because your already having a person plan out their route. UberCab? Rather Uber