6Natke ,P.A. & G.A. Falls. Economies of scale and the demand for money [J]. Small Business Economics ,2010,35(3):283-298.
7Foley, C.F.,J.C.HartzelI,S.Titman & G.T wite. Why do firms hold so much cash? A tax-based explanation [J]. Journal of Financial Economics ,2007,86(3):579-607.
8Pinkowitz, L.,R.M.Stulz & R.Williamson. Multinationals and the high cash holdings puzzle [J]. The National Bureau of Economic Research, 2012,18120.
9Pinkowitz, L. & R.Williamson.Bank power and cash holdings: Evidence from Japan[J]. Review of Financial Studies ,2001,14(4):1059-1082.
10Riddick, L.A. & T.M.Whited.The corporate propensity to save[J].Journal of Finance,2009,64(4): 1729-1766.