We use panel data from the German Socio-Economic Panel to estimate the determinants of language fluency of immigrants and its impact on earnings. Self reported measures of language proficiency contain substantial reporting errors. We specify a panel data model which takes explicit account of...

We propose a development process of commodity futures contracts in which the decisions and wishes of potential customers are investigated simultaneously with the necessary technical properties that need to be met for trading to take place. Within this framework the relationship between trading...