Imperio romano cómo fue el desarrollo económico en cada una de ellas :moneda ,tipos de trueque ,medidas de cambio, productos ,sistemas productivos ,otras ideas relacionadas con la economía

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

result of the incas claiming exclusive right over numerous traditional routes, some of which had been constructed centuries earlier mostly by the wari empire