贸易数据告诉我们：在2008年之前那十年，世界贸易以每年7%左右的速度增长，但在2009年其降速却快于全球GDP的降速（也比大萧条时期更剧烈 ） 。
Trade data tell the story: after increasing by about 7% annually in the decade before 2008, world trade fell faster than global GDP in 2009 (and more sharply than during the Great Depression).