The IMF would have to be able to issue additional SDRs in periods of shortage, as when the Fed provided dollar swaps to ensure adequate dollar liquidity in the second half of 2008. At the moment, countries holding 85% of IMF voting power must agree before SDRs can be issued, which is no recipe for liquidity.
特别提款权如果要成为一个真正的国际货币的话，还需要克服一些障碍。当特别提款权供应不足的时候，IMF要适当地增发，就如同2008年下半年，美联储为了增加市场流动性而增发美元那样。如果还需要有85%以上的成员国同意，特别提款权才可以发放的话，市场的流动性就不可能增加了。