We find that contrary to common perception, cooperation as equilibrium of the infinitely repeated discounted prisoner's dilemma is in many relevant cases not very plausible, or at least questionable: for a significant subset of the payoff-discount factor parameter space cooperation equilibria...

Why do money and markets crowd out cooperative relations? This paper characterizes the effects of intertemporal preferences, money, and markets on players' ability to cooperate in material-payoff supergames. Players' aversion to intertemporal substitution facilitates cooperation by decreasing...

This report presents a computer model for evaluating the cost-effectiveness (CE) of Hormone Replacement Therapy (HRT). The model is an extension of a previous model and includes also the risk of spine and wrist fracture. New Swedish data on risk of coronary heart disease and related mortality...

The impact of compulsory schooling laws as well as the abolition of early selection by ability remain important issues in the educational debate. These issues were the focus of a major education reform in Sweden which was implemented in the 60s. The reform was preceded by a ``social experiment''...

Bivariate VAR models are Monte Carlo simulated and OLS estimated, The resulting biases are used to compare two alternative approximations to the bias. They are found to be equivalent for first-order models, whereas for second-order models Nicholls and Pope's approximation outperforms Tjostheim...

We investigate the welfare implications of changing a proportional capital income tax for a model economy in which heterogeneous households face labor income risk and trade only one asset. Labor taxes are adjusted at the time of the reform to maintain long run budget balance. Our stochastic...

In analysis of atemporal models, comparative statics experiments are typically carried out, often employing envelope properties, such as Roy's identity, Hotelling's lemma and Shephard's lemma, in order to simplify the analysis. In analysis of dynamic models, such experiments are seldom...

The purpose of this study was to estimate the risk and mortality of breast cancer recurrences in Swedish women, and to analyse changes over time and variations between patients in different risk groups. Such estimates are of key importance for modelling the cost-effectiveness of different...

Who gains from more information on the quality of pharmaceutical drugs? Are there incentives for voluntary post-approval clinical trials among pharmaceutical companies? Contrary to popular belief, this paper shows that it is not in the consumer interest that clinical evidence establishing the...

We develop a structural bond pricing approach and implement it on a large panel of US industrial bonds using an efficient maximum likelihood methodology. We evaluate the model's ability to predict yield spread levels and changes out-of-sample. Errors are smaller and distinctly less variable than...