The current U.S. and Eurozone depression isn't because of China. It's because of domestic debt deflation. Commodity prices and consumer spending are falling, mainly because consumers have to pay most of their wages to the FIRE sector for rent or mortgage payments, student loans, bank and credit card debt, plus over 15 percent FICA wage withholding for Social Security and Medicare actually, to enable the government to cut taxes on the higher income brackets, as well income and sales taxes.
The aim of academic trade theory is to tell students, "Look at the model, not at how nations actually develop." So of all the branches of economic theory, trade theory is the most wrongheaded.