Bronze knives and bronze spades were common barter items in ancient China, but a bit awkward or hazardous to carry around to trade. Some of China's first coins were made to look like a knife or like a stylized spade, so that people would think of them as money, however they were too thin and fragile to be used for anything but money. I was in NYC and picked up some replicas of these interesting examples of coinage from China as the economy evolved from a barter to a monetary economy. To get yourself one, solve this puzzle.
You can check your answers for this puzzle on GeoChecker.com.