Ideally the degree of intergenerational mobility within a country would be measured by the association between the SES of parents throughout a persons childhood and their life-time earnings as an adult. This is extremely data intensive and the existing literature on intergenerational economic mobility, therefore approximates this with point in time measures. This paper is the first to estimate (near) life-time economic mobility and and highlights that there are there major biases when using point in time measures that overstate true levels of mobility.
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