The currency is closely monitored by the Central Bank of China and in the spot market, is allowed to rise or fall by 1 percent from the set parity rate each trading day.

FORBES: China Currency To Gain Against Dollar This Year

They know where the bar is set as far as reaching parity with the new Delta and United contracts.

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But Health Minister Earl Howe said it was unnecessary because "parity" between mental and physical illness was already set out as one of the overall requirements of the bill.

BBC: Government suffers defeat over NHS Bill