The sharing economy is here to stay. If you’ve ever taken an Uber instead of a taxi, or stayed at an Airbnb instead of a hotel, or used a WeWork workspace instead of a traditional office, you’ve participated in the sharing economy. According to Time magazine, one in five Americans say they’ve worked in the sharing economy, and two in five say they’ve used services through it. The sharing economy is currently estimated at about $15 billion, but PricewaterhouseCoopers projects revenues from sharing in the travel, car....