We test whether people's tendency to stick with the default option can help save resources. In a natural field experiment we switch printers' default settings, from simplex to duplex printing, at a large Swedish university. The results confirm that roughly one third of all printing is determined...

Users of the social networking service Facebook have the possibility to post status updates for their friends to read. In turn, friends may react to these short messages by writing comments or by pressing a Like button to show their appreciation. Making use of five Swedish accounts, we set up a...