The Worlds Deepest Bin TheFunTheory.com

TheFunTheory.com conducts an experiment in order to get park passersby to throw their trash in a bin by making it a fun activity.

The experimenter installs a motion-detection device that triggers an entertaining sound when rubbish is thrown into the bin. During a one day period 72 k of trash is thrown into the bin; a nearby trash bin receives less than half that amount. What kind of experiment is being conducted in this video?