As shown in Chart 6, since that year the import price of energy products has more than tripled, reflecting the effects of both demand and supply-side factors. The import price index of manufactured products, by contrast, has increased only moderately and indeed it has declined slightly since 2001.
"Non-Monetary Effects of the Financial Crisis in the Propagation of the Great Depression," American Economic Review, vol. 73 (June), pp. 257-76. Bernanke, Ben S., and Alan S. Blinder (1988). "Credit, Money, and Aggregate Demand," American Economic Review, vol. 78, Papers and Proceedings of the 100th Annual Meeting of the American Economics Association, May, pp. 435-39. Bernanke, Ben S., and Mark Gertler (1989).