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| José carlos R. Alcantud |
| Universidad de Salamanca |
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| Facultad de Economía y Empresa |
| Campus Unamuno |
| calle san ignacio |
| Salamanca, Vizcaya E37007 |
| Spain |
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| jcr@usal.es |
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| http://diarium.usal.es/jcr |
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JEL Areas:
C : Mathematical and Quantitative Methods
D : Microeconomics |
