Does it help to come to more creative solutions faster when you promise people rewards? This is what German psychologist Karl Duncker tested in the first half of the 20th century with the candle problem. In this exercise he tasked test subjects to put a candle on the wall and lighten it up. The caveat was that the objects available included a box of tacks, a box of matches and the candle. How would they fix it to the wall? And would they come up with creative solutions faster if he promised them a large reward?
Watch this video to see what happened.