Theoretically, the tension between wage-led and profit-led models of growth arises from the combinations of coefficients in linear specifications of the Cambridge growth model. One result is that the total effect of a decline in the wage share on aggregate demand depends upon the relative magnitude of the reactions of consumption and investment demand to changes in income distribution. If the total effect is negative, the demand regime is said to be wageled. If positive, the regime is called profit-led. Whether the negative effect of low wages on consumption or the positive effect on investment predominates is an open question (Stockhammer and Onaran 2013). We follow through with the implication that the consumption function must be investigated closely. Thereby, we counterpoise the attention given to the propensity to invest by Post Keynesians. The agenda there was given by Kalecki: “the determination of investment decisions remains… the central pièce de résistance of economics”