Joan Robinson's Growth Model is a simple model of economic growth, reflecting the working of a pure capitalist economy, expounded by Joan Robinson in her 1956 book The Accumulation of Capital.
In a later book, Essays in the theory of Economic Growth,[2][3] she tried to lower the degree of abstraction.
Robinson presented her growth model in verbal terms.
A mathematical formalization was later provided by Kenneth K. Kurihara.
where Y is the net national income, w is the money wage rate, N is the number of workers employed, K is the amount of capital utilized, p is the average price of output as well as of capital and π is the gross profit rate.The above equation indicates that the profit rate is a functional of labour productivity (p)and real wage rate(w/p)and capital ratio.