This Paper reports a randomized field experiment in which first year economics and business students at the University of Amsterdam could earn financial rewards for passing all first year requirements before the start of their second academic year. Participants were assigned to a high reward...

Over the last decade, many countries have experienced dramatic increases in university enrolment, which, when not matched by compensating increases in other inputs, have resulted in larger class sizes. Using administrative records from a leading UK university, we present evidence on the effects...

Analysis of our new, 16-year dataset on the Colombian civil war finds under Uribe: guerrilla and paramilitary attacks dropping sharply against long-run averages since 1988, lower for April-December, 2003; government-guerrilla clashes at all-time highs, exceeding guerrilla attacks; civilian killings...

This paper considers an economy where skilled and unskilled workers use different technologies. The rate of improvement of each technology is determined by a profit-maximizing R&D sector. When there is a high proportion of skilled workers in the labour-force, the market for skill-complementary...

Expected earnings and expected returns to education are seen by labour economists as a major determinant of educational attainment. In spite of this, the empirical knowledge about expectations and their formation is scarce. In this Paper we report the results of the first systematic study of the...