Optimization problem of supply chain collaborative planning about multi-suppliers, multi manufacturers and multi distribution centers was studied.

研究了多供应商、多生产厂和多分销中心供应链系统协同计划的优化问题。

youdao

That price tag reflects a serious problem of supply and demand.

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But the third argument put forward by those who say we can't control immigration is that immigration is not just a problem of supply but of demand.

BBC: In full: David Cameron immigration speech

So the most recent, tiny remnant of the old gold standard (the Bretton Woods System only applied to international exchanges, it had no domestic impact on the US or other nations) did indeed collapse for exactly the problem of the supply of gold.

FORBES: Ben Bernanke's Paper Dollar Embodies Systemic Risk