Whenever the supply of a good is limited, there is potential for exuberance.

一种商品供给的有限性总是伴随着繁荣的潜在性。

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Although it could never become the most common route by which to enter teaching, the scheme could help to boost the supply of good head teachers (Teach First applicants are screened for leadership potential).

ECONOMIST: Tory plans to make schools better