Gravity Redux: Estimation of gravity-equation coefficients, elasticities of substitution, and genera

A large class of models with CES utility and iceberg trade costs are now known to generate isomorphic “gravity equations.” Economic interpretations of these ... 1. Introduction For half a century, the “gravity equation” has been used to estimate econometr...

叫這樣的朋友幫你拍照，會不會想死？

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Surfer Almost Swallowed by Whale

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罵人不帶髒字的歇後語

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你有沒有親弟弟啊？

一天老師對小明說：“小明啊！你有沒有親弟弟啊？”小明突然往自己的褲襠看了看，然後皺著眉頭對老師說：“老師，我親不到！”   ...