hence a single inequality statistic may end up capturing a relatively unimportant average effect of inequality on growth and more complex indicators of the profile of income inequality should be used for example ratios of income percentiles on either side of the median or decile share ratios see also deininger and squire cross country correlations are clearly only suggestive of the possible link between inequality and mobility however due to the likely biases induced by observed and unobserved countrylevel confounding factors