The world economy was highly integrated in 1914, but economic interdependence declined during the next three decades. The global economy did not recover that same level of integration until 1970, and even then it remained divided by the Iron Curtain.
但这种平坦化的进程是可逆的。以前也曾发生过类似的情况。1914年世界经济曾经高度融合，但接下来的30年中世界各国在经济上的相互依赖不断下降。直到1970年，全球经济才恢复到曾经有过的融合程度，而且当时仍然受到铁幕的重重阻隔。