Borrowing countries would live up to its standards of economic behaviour, fearing that otherwise it would refuse further lending.

借款国将要符合其经济行为的标准，否则将有被IMF拒绝进一步放贷的担心。

This would suggest that raising top tax rates is likely to produce little extra revenue, while distorting economic behaviour further.

这就意味着提高税率上限可能不会带来多少额外收益，反倒进一步扭曲经济行为。