We develop a simple model of labor market participation, human capital degradation, and re-training. We focus on how non-participation, as a distinct state from unemployment and employment, is determined by the welfare system in interaction with labor market conditions and personal...

We show in this paper how a tax law can be formulated which (i) does not distort economic incentives of individuals and firms, (ii) is based on low information requirements, and (iii) which does not violate important behavioral facts such as fairness in taxation of the subjects. That for, a...

This paper makes use of perturbation theory to solve analytically a class of robust control problems implied by Anderson, Hansen and Sargent (2000) (AHS (2000)) model of a preference for robustness. For the constant opportunity set model, we provide (i) asymptotic expressions that characterize...

Three channels through which the IMF rescue package may affect international leading can be distinguished: debtor-side moral hazard, creditor-side moral hazard, and debtor and creditor-side moral hazard. We show that if the rescue package fully benefits the debtor, no credit contract between him...

According to the Becker-Murphy model, the consumption of a habitual good follows from forward-looking, maximizing, and time consistent choices on the basis of specific preferences. The ongoing use of such a good builds up a stock of consumption capital which, in turn, affects both its present...

Online banking fraud occurs whenever a criminal can seize accounts and transfer funds from an individual's online bank account. Successfully preventing this requires the detection of as many fraudsters as possible, without producing too many false alarms. This is a challenge for machine learning...

We consider implied volatility, time-dependent volatility, local volatility and stochastic volatility. We derive relationships between the different concepts. The relationships are of an exact analytical type if this is possible, else we use expansions to obtain approximate expressions. We close...

We recall some fundamentals on Levy processes. Then the Gamma distribution, the Variance Gamma process and option pricing for this process are considered in detail. To implement the Variance Gamma model for option pricing, we use the fast Fourier transform, time change and discuss error bounds

We analyze the empirical predictions of ambiguity aversion in intertemporal heterogenous agents economies. We examine equilibria for two tractable wealth--homothetic settings of ambiguity aversion in continuous time. Each setting is motivated by a different robust control optimization problem....

We present a geometric approach to discrete time multiperiod mean variance portfolio optimization that largely simplifies the mathematical analysis and the economic interpretation of such model settings. We show that multiperiod mean variance optimal policies can be decomposed in an orthogonal...