How Europe manages the sharing economy

Like me, you have probably seen Europe's cities change in the past few years.

Bike couriers in Strasbourg that no longer work for a single pizza delivery shop, but instead are traversing the streets with hot meals from an array of different restaurants.

Tourists dragging their trolley suitcases through the residential streets of Amsterdam, clearly staying at someone's apartment instead of a hotel.

Or the counter-reaction: protests in Brussels by taxi drivers who feel they ca...