Governments that do embark on structural reform often find it frustrating to wait for that often-elusive “critical mass” of revitalized sectors to materialize; and economists find it very difficult to predict the timing and magnitude of the growth liftoff that should follow. Complicating matters further, the inevitability of unanticipated developments, whether homegrown or external in origin, means that course corrections often are needed.
实施了结构改革的政府往往不得不沮丧地等待部门复兴的“临界值”的产生，而这一临界值为多少很难界定；此外，经济学家也很难预测随之而来的增长腾飞的时机和程度。更加复杂的是，意料之外的情况难免会发生，不管来自国内还是国外，这意味着往往会有修正阶段。