Choke price — the maximum price anyone would be willing to pay for a unit of the resource. At higher prices, the demand for that resource would be zero.

溢价——对于每单元资源人们都将支付的最高价格。在更高的价格，对此资源的需求将为零。

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According to news reports, No. 1 producer Anglo American Platinum has received a demand from South African workers for higher pay, plus there were reports of a protest at a Royal Bafokeng Platinum site.

FORBES: PGMs Hit Multi-Month Highs On Fears S. African Labor-Related Supply Issues May Spread