Sharing your car or home involves a substantial risk and requires trust so people have traditionally been doing it mostly within their private networks of frien

Sharing your car or home involves a substantial risk and requires trust so people have traditionally been doing it mostly within their private networks of friends and family. What Uber, Airbnb and the like have achieved is the application of technology, reviews and rating schemes to build and scale these trust networks up to sizes that are more practical for a society.