The cost of acquiring the object is part of this question on whether you should share or charge, share or rent. Some people are going to be owners and others will be borrowers and sharers. And it doesn't even have to follow the contours of what we now think of as market exchanges.
Economist and author Michael Munger of Duke University talks about his book, Tomorrow 3.0, with EconTalk host Russ Roberts. Munger analyzes the rise of companies like Uber and AirBnB as an example of how technology lowers transactions costs. Users and providers can find each other more easily through their smartphones, increasing opportunity. Munger expects these costs to fall elsewhere and predicts an expansion of the sharing economy to a wide array of items in our daily lives.