The most recent episode of the Freakonomics podcast discussed the challenges presented by the sharing economy, a socio-economic system built around the sharing of human and physical resources.   

Here is a description of the podcast: 

At issue is the so-called sharing economy, a range of services that facilitate peer-to-peer transactions through the Internet. Companies like Airbnb, Uber, and Lyft have seen rapid growth and eye-popping valuations, but as they expand around the world, they are increasingly butting heads with government regulators.