This paper reports evidence of a banking liquidity impact on stock prices in the three Asean countries. Banking liquidity impacts suggested by Friedman is yet to be fully investigated nor verified despite several attempts. If improved liquidity of banks leads to credit expansion, which in turn leads to more positive net present value projects undertaken by firms, earnings of the latter must go up, and hence the share prices should rise. This link is worth an investigation. According to an influential of the US stock market, up to 52% of share returns are due to changes in the macro economy. Using a 3-equation structural model as well as employing corrections for cross-section dependence, we examine the link between money supply, liquidity and stock prices over 2001:4Q and 2012:2Q in three developing countries. It is found money supply changes lead to a positive liquidity effect and banking liquidity impacts share market prices positively. These findings are new and in support of Friedman's liquidity proposition, and also constitute evidence of a banking liquidity having a positive effect on asset prices.

The money supply impacts on interest rate and liquidity were first proposed in 1961 by Friedman, the late Nobel laureate. The liquidity effect has yet received unanimous empirical support. Also, research interest on liquidity subsided in the 2000s. Using quarterly data over 1960–2011 and simultaneous solution to a system of equations, this paper reports positive liquidity effect from money supply. By extending the system of equations with a liquidity equation and after controlling the effect of earnings, evidence is found of a significant positive effect from liquidity on share prices. Money supply is found to be endogenous as in post Keynesian theory. These findings, obtained after solutions to several econometric deficiencies in prior studies, provide clear verification of the endogenous money supply theory, money effect on liquidity and on the extension of the model for a liquidity effect on asset prices.