Alon Cohen

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Skilled migrants typically contribute to the welfare state more than they draw in bene…ts from it. The opposite holds for unskilled migrants. This suggests that a host country is likely to boost (respectively , curtail) its welfare system when absorbing high-skill (respectively , low-skill) migration. In this paper we …rst examine this hypothesis in a(More)
When planning problems have many kinds of resources or high concurrency, each optimal state has exponentially many minor variants, some of which are " better " than others. Standard methods like A * cannot effectively exploit these minor relative differences, and therefore must explore many redundant, clearly subopti-mal plans. We describe a new optimal(More)
We study an online learning framework introduced by Mannor and Shamir (2011) in which the feedback is specified by a graph, in a setting where the graph may vary from round to round and is never fully revealed to the learner. We show a large gap between the adversarial and the stochastic cases. In the adversarial case, we prove that even for dense feedback(More)
Skilled migrants typically contribute to the welfare state more than they draw in bene…ts from it. The opposite holds for unskilled migrants. This suggests that a host country is likely to boost (respectively , curtail) its welfare system when absorbing high-skill (respectively , low-skill) migration. In this paper we …rst examine this hypothesis in a(More)
We survey the problem of learning linear models, in the binary and multiclass settings. In both cases, our goal is to find a linear model with least probability of mistake. This problem is known to be NP-hard and even NP-hard to learn improperly (under relevant assumptions). Nonetheless, under certain assumptions about the input the problem has an algorithm(More)
My work spans the fields of computational visual processing, and machine and perceptual learning, specializing in: • Computer vision • Visual perception • Machine learning Education Summa cum laude. Advisor: Prof. Ilan Eshel. Dissertation: " A Solution to the prisoner's dilemma in a series of stochastic games with possible application to the evolution of(More)
The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research. ABSTRACT Skilled migrants typically contribute to the welfare state more than they draw in benefits from it. The opposite holds for unskilled migrants. This suggests that a host country is likely to boost (respectively,(More)
The paper analyzes the e¤ect of the generosity of the welfare state on the skill composition of immigrants. We develop a parsimonious model in which the e¤ect of an increase in the generosity (and taxes) of the welfare state on the skill composition of immigrants under free migration is negative. The reason is that welfare state bene…ts attract unskilled(More)
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