3Krugman Paul. Thinking about the Liquidity Trap [J] . Journal of the Japanese and International Economies, Vo1.14, Iss.4, pp. 221-37.
4Krugman, Paul R., Japan' s Trap, http://www.mit.edu/krugman/www/, 1998.
5Goodfriend, Marvirr Overcoming the Zero Bound on Interest Rate Policy [J] . Journal of Money, Credit, and Banking, vo132, No.4, 2000, pp. 1007-1035.
6Bernanke, Ben S. and Reinhart, Vincent R. Conducting Monetary Policy at Very Low Short-Term Interest Rates [J] . American Economic Review Vol.94, No.2, May, 2004.
7Hiroshi Ugai. Effects of the Quantitative Easing Policy: A Survey of Empirical Analyses.2007 [R] . Bank of Japan Working Paper Series.
8KRUGMAN PAUL. Thinking about the Liquidity Trap [J]. Journal of the Japanese and International Economies, 2000, (14): 221-37.