One indicator could be changes in the exit and entry rates in a particular industry.

在特定行业里，这种指标的进入率和离开率应是可变的。

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Nearly all of the 30 OECD countries have seen entry rates increase, and the extra cash needed has come from a variety of sources.

几乎所有的30个OECD国家的入学率都有所上升，而所需要的额外的现金则来源于多种途径。

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For example, although demand for higher education has fallen in England, the actual entry rates for young people are close to trend.

BBC: Record fall in university places taken up, says Ucas

Crazy as it sounds, even though venture capitalists stand to benefit individually by reduced capital gains taxes--partners split 20% to 30% of a fund's profits--the reduced rates would also lower entry barriers for new competition in the form of angels and corporations.

FORBES: Digital rules

As well as boosting demand, these schemes have helped to raise standards (because beneficiaries must reach minimum entry requirements) and cut drop-out rates.

ECONOMIST: Higher education in Brazil