Two people in Budapest run shops next door to each other. They want to boost sales but they do not have money for marketing. In fact both just have a circle, a line and two blobs. And then they find some yellow paint in the back.
One comes up with this:
Another devises this teaching aid for his sales girls:
Is it possible to build a culture where people smile to each other and treat each other decently, thereby increasing the level of economic activity? If so, this has big implications for the character of economic policy.