But, for individual economies, relative productivity versus income levels determines the share of global tradable aggregate demand that is accessible. Unlike the non-tradable side of the economy, the domestic component of global tradable demand is not an absolute constraint on growth; nor is the rate of growth of global tradable demand an absolute constraint, given the possibility of increasing share.
但是，对于具体国家而言，生产率与收入水平的相对比较决定了其在可实现全球可贸易总需求中所占的份额。与经济中的不可贸易部门不同，全球可贸易需求中的内需部分并不是增长的绝对约束；全球可贸易需求增长率亦然，这是因为存在扩大份额的可能。