Similarly, the seller can rate us as trustworthy buyers. Teachers there are judicious and selective in using technology in their classrooms, but they embrace technology when it comes to enhancing and sharing professional practice. When I visited Shanghai in 2013,1 saw teachers using a digital platform to share lesson plans. That in itself is not unusual, what made it different from other places was that the platform was combined with reputational metrics. The more other teachers downloaded, or critiqued or improved lessons, the greater the reputation of the teacher who had shared them.