A price war has broken among by for from in of on out over to with across the world among by for from in of on out over to with taxi companies. There is increasing competition among by for from in of on out over to with passengers because among by for from in of on out over to with the different apps that can order taxis. Some taxi companies are cutting their fares among by for from in of on out over to with more than half to beat competitor companies. The world's biggest taxi-booking app is called Uber. It was founded among by for from in of on out over to with 2009 and now operates among by for from in of on out over to with over 200 cities across the globe. Many drivers of London's traditional black taxis are unhappy among by for from in of on out over to with taxi apps. They argue that drivers among by for from in of on out over to with app cabs are too inexperienced to drive taxis in London. Black cab drivers must pass a difficult test among by for from in of on out over to with their knowledge among by for from in of on out over to with London's streets to get their taxi-driving license. They have slashed some of their fares from $45 among by for from in of on out over to with $7.50. The U.K. boss of Uber said the price war would benefit his company and result among by for from in of on out over to with higher profits, saying: "There's a lot among by for from in of on out over to with competition among by for from in of on out over to with the app makers and, to a certain degree, you need to think of things that you can do to stand among by for from in of on out over to with from the crowd." London black cab driver Anthony Street says business remains good despite the app companies. He said: "There are lots among by for from in of on out over to with technologies that are changing things among by for from in of on out over to with us, but it's up to drivers." One of New York's biggest taxi companies has called among by for from in of on out over to with Uber to have its license suspended. It says Uber is illegally using data collected among by for from in of on out over to with passengers. In Singapore, the government has just announced that it would start regulating taxi app companies.