This paper introduces and analyses a setting with general heterogeneity in regression modelling. It shows that regression models with fixed or time-varying parameters can be estimated by OLS or time-varying OLS methods, respectively, for a very wide class of regressors and noises, not covered by...

We apply a partial identification analysis using comprehensive Norwegian register data to investigate the causal effect of father’s income on child income. We find a strong association between the incomes of fathers and children. The causal effect, however, equals at least 1% and at most 51%...