However, this model is dependent on limited donor funding and may be difficult to sustain in the long-run.

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This makes the model unduly dependent on foreign aid, a common complaint of Africans about many Western-inspired development projects.

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Last week I wrote in this space that the future facing higher education in the UK poses some pressing challenges, including adjusting to a financial model more dependent upon tuition revenues.

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What this means is that the company is successfully transitioning it business from a PC dependent model to the new age of mobility.

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But like any model, its proper use is entirely dependent on the assumptions used in that model.

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Mr. Geithner is certainly right that China needs to adjust its export-dependent growth model, which has struggled amid the decline of global demand.

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However, most of Europe uses a point-to-point, time-dependent fee model.

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Gone is the low value-added export model, and in its place is an economy increasingly dependent on its own people and their consumption.

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But unlike those two, which are almost entirely dependent on advertising, LinkedIn has honed a business model that makes money five different ways.

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And the move to installing fiber and manufacturing its own hardware mean that the company is diversifying its business model to include more direct payments from users and not be wholly dependent on advertising revenues to fund all of this infrastructure.

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For more than a decade, the world has operated under an economic model in which most of the world under-consumed while becoming dangerously dependent on exporting to a gluttonous, debt-ridden American consumer.

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The scientists used a powerful computer model to simulate how a liquid released at the spill site would disperse and circulate, producing results that are not dependent on the total amount released.

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