经济学——研究社会如何管理稀缺资源的学科。
Economics is the study of how society manages its scarce resources.
经济学一直是以研究稀缺资源为中心的，而现在的稀缺资源已从劳动和资本开始变为自然资源。
The scarcity of resources is all the time the center of the research. But presently the rare resources have begun to change from labor and capital into natural resources.
经济学研究人们如何进行抉择，以使用稀缺的或有限的生产性资源。
Economics is the study of how people choose to use scarce or limited productive resources.
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