The proposed New York legislation includes an escape valve, but it requires a super-majority vote (60%) to raise taxes by more than 2% in a year.

FORBES: Property Tax Caps and Local Governance

They do not have the safety-valve of banking books, where souring assets can escape the rigours of mark-to-market accounting.

ECONOMIST: Investment banking: Is there a future? | The

As a result, shareholders gave CEOs an escape valve that, the reasoning went, would encourage them to work in the long-term interests of their companies.

WSJ: In Defense of the CEO