Why what happens in China matters more now than it did during SARS

From the Economist:

China now accounts for 16% of global gdp, up from 4% back then. Its share of all exports in textiles and apparel is now 40% of the global total. It generates 26% of the world’s furniture exports. It is also a voracious consumer of things such as metals, needed in manufacturing. In 2003 China sucked in 7% of global mining imports. Today it claims closer to a fifth.