With the timing value of cash theory, the model supposes that the unlimited net revenue which can be used to pay off the debt increases steadily.

该模型运用货币资金时间价值理论，假设高校可用于偿还贷款本息的非限定性净收入呈稳定增长的态势。

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Shadow Treasury minister Chris Leslie said the value and timing of the sale raised "serious questions".

BBC: Northern Rock: Sale good for taxpayers, says government

Shadow Treasury minister Chris Leslie had sent a letter to Mr Osborne, raising concerns about the value and timing of the sale.

BBC: Northern Rock: Osborne to reveal EU deal over 2013 sale

"It's an interesting concept and it certainly provides a potential value for timing and alerting people to take a break, " David Rempel, Director of the Ergonomics Program at UC Berkeley and Professor of Medicine at UCSF, told Wired.

CNN: Computer monitor uses sensor to promote better posture