The “Collapse in Quality” Hypothesis
利用美国HS-10产品类别和来源国的进口数据，检验2008-2009年国际贸易崩溃期间高质量进口是否比低质量进口下降更多，结果发现几乎没有稳健证据支持该假说。
This paper evaluates the hypothesis that during the 2008–2009 collapse in international trade, imports of higher quality goods experienced larger reductions compared to low-quality imports, using data on US imports disaggregated by HS-10 product category and source country. We find little, if any, robust econometric evidence in support of this hypothesis.