Let's talk about trust. We all know trust is fundamental, but when it comes to trusting people, something profound is happening. Please raise your hand if you have ever been a host or a guest on a B&B. Wow, that's a lot of you. Who owns Bitcoin? Still a lot of you, okay. And please raise your hand if you've ever used Tinder to help you find a mate. This one's really hard to count because you're kind of going like this. So these are all examples of how technology is creating new mechanisms that are enabling us to trust unknown people, companies, and ideas. And yet at the same time, trust in institutions, banks, governments, and even churches is collapsing. So what's happening here and who do you trust? Let's start in France with a platform, or I should say, with a rather funny-sounding name, BlaBlaCar. It's a platform that matches drivers and passengers who want to share long-distance journeys together. The average ride taken is 320 kilometers, so it's a good idea to choose your fellow travelers wisely. Social profiles and reviews help people make a choice. You can see if someone's a smoker, you can see what kind of music they like, you can see if they're going to bring their dog along for the ride. But it turns out that the key social identifier is how much you're going to talk in the car. Bla means not a lot, flag means why are you on, and BlaBlaBla means you're not going to stop talking the entire way from London to Paris. It's remarkable, right? That this idea works at all because it goes against the lesson most of us were taught as a child: never get in a car with a stranger. And yet, BlaBlaCar transports...