This research provides an economic model of the way people behave during an IQ test. We distinguish a technology that describes how time investment improves performance from preferences that determine how much time people invest in each question. We disentangle these two elements empirically...

This research documents the effects of different forms of family disruptions – measured by separation, divorce and death – on personality development of British children included in the 1970 British Cohort Study. There are statistically significant correlations between family disruptions...