economic/economical

economic /ˌi:kəˈnɔmik/ adj. 经济(上)的，经济学的：an economic basis 经济基础；an economic structure 经济结构；an economic blockade 经济封锁［考句］Although not an economist himself, Dr. Smith has long been a severe critic of the government’s economic politics.尽管Smith不是一个经济学家，但他长期以来一直尖锐的批评政府的经济政策。  

economical /ˌi:kəˈnɔmikəl/  adj. 节俭的，节约的，经济的：be economical of one’s time (money) 节省时间(金钱) The engine is fairly economical of fuel. 这部发动机还算省油。