What fo you mean by catch up effect?

In simple terms catch up effect says that growing economies grow faster as compared to developed economies.Catch up effect, alternatively called the theory of convergence, states that poor or developing economies grow faster compared to economies with a higher per capita income and gradually reach similar high levels of per capita income. Thus, all economies, over time, may converge in terms of income per head.

The catch up effect briefly stated implies that the poorer nations grow much faster because of higher possibilities of growth and over time catch up with the richer countries in terms of per capita income such that the divide between the two gets minimized.