A fictional country named Guilder has a population with higher levels of income than other nearby countries. This extra income has been a success in the past for Guilder’s manufacturers because they can market their goods and wares with great success. This year, however, much of the population already owns many of the products produced in Guilder. Thus the products made in Guilder have reached market saturation. This type of market experience happens in which type of economically classified country?