A grey market has flourished, with middlemen hoarding drugs and selling them at a premium.

灰色市场大行其道，中间商囤积居奇，从中牟利。

He has asked the Justice Department to investigate the grey market, a step that will treat a symptom of the shortage but not its cause.

他已经要求司法部Justice Department介入调查上述灰色市场，但这只是对药品短缺治标不治本的步骤。

Policymakers are keen to shrink the size of grey markets and increase tax takes, and in part because, unlike in America, new payment systems did not have to push aside existing ones and those who benefited from them.

政策制定者热衷于缩小灰色市场的规模并增加税收，部分原因是， 与美国不同，新的支付系统不必排斥现有支付系统以及从中受益的人。