Investment, Exports and Growth A Cross-Country Analysis Prabhat Patnaik C P Chandrasekhar Growth experience across underdeveloped countries indicates that it is really the investment ratio which plays the crucial role in determining the growth rate. The so-called 'efficiency of resource use,' over which so much hullabaloo has been raised in recent years, does not, by implication, appear to be a particularly significant factor determining relative growth performance. What is more, even the relative export performance across countries appears to be dependent on the relative investment ratios.