Our new proposal "Currencies" really should be in the Science category where Economics is. Currencies are NOT just about business use of currency but a wide range of currency types including citizens, voluntary organisations and local government. Therefore Business is too narrow a category.
In addition, complementary currencies are studied as an academic discipline with its own journal the International Journal of Community Currencies - running continuously since the 1980s and several academic conferences in the last 10 years. It really qualifies as a Science.