Helpman, Melitz, and Rubinstein (2008)–HMR–present a rich theoretical model to study the determinants of bilateral trade flows across countries. The model is then empirically implemented through a two-stage estimation procedure. This note seeks to clarify some econometric aspects of the estimation approach used by HMR and explore the consequences of possible departures from the maintained distributional assumptions.
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Paper provided by University of Essex, Department of Economics in its series Economics Discussion Papers with number
662.
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