She was supposed to notify the medical worker, who would certify that there was a problem. Then the medical worker called the wheelchair repair companies to get the cheapest bid.

她该通知医务人员，由他来证明问题确实存在，然后打电话给各家轮椅维修公司，拿到最低的报价。

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This leads to a bias towards selecting the cheapest bid, even if it must subsequently be renegotiated.

ECONOMIST: Defence spending

However, the government will only subsidize an amount equal to the bid proposed by the second-cheapest plan.

FORBES: Ron Wyden and Paul Ryan's Bipartisan Plan for Health Care and Medicare Reform

The annual premium-support payment would be set at the second-lowest bid, and seniors who chose the cheapest plan would keep the difference.

WSJ: Joseph Rago: The Forgotten History of Ryan's Medicare Reform