According to him, the focus of the existing entrepreneurship discussion was on the first—calculative—dimension whereas he conceived of the need to recognize the second dimension as the real entrepreneurial function. Kirzner felt that the difference mattered because Schumpeter and all the other abstract calculation experts failed to recognize the most important concrete dimension of development, namely taking advantage of opportunities presented by the market process.

Dieter Plehwe, Quinn Slobodian & Philip Mirowski (eds.), Nine Lives of Neoliberalism, loc. 277