英文标题：
《Hierarchicality of Trade Flow Networks Reveals Complexity of Products》
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作者：
Peiteng Shi, Jiang Zhang, Bo Yang, Jingfei Luo
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最新提交年份：
2014
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英文摘要：
  With globalization, countries are more connected than before by trading flows, which currently amount to at least 36 trillion dollars. Interestingly, approximately 30-60 percent of global exports consist of intermediate products. Therefore, the trade flow network of a particular product with high added values can be regarded as a value chain. The problem is weather we can discriminate between these products based on their unique flow network structure. This paper applies the flow analysis method developed in ecology to 638 trading flow networks of different products. We claim that the allometric scaling exponent $\\eta$ can be used to characterize the degree of hierarchicality of a flow network, i.e., whether the trading products flow on long hierarchical chains. Then, the flow networks of products with higher added values and complexity, such as machinery&transport equipment with larger exponents, are highlighted. These higher values indicate that their trade flow networks are more hierarchical. As a result, without extra data such as global input-output table, we can identify the product categories with higher complexity and the relative importance of a country in the global value chain solely by the trading network.
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中文摘要：
随着全球化的发展，各国之间的贸易往来比以往任何时候都更加紧密，目前的贸易往来至少达到36万亿美元。有趣的是，大约30-60%的全球出口由中间产品构成。因此，具有高附加值的特定产品的贸易流网络可以被视为一个价值链。我们可以根据这些产品的独特网络结构来区分它们。本文将生态学中的流量分析方法应用于638个不同产品的交易流量网络。我们声称，异速标度指数$\\eta$可用于表征流动网络的层次性程度，即交易产品是否在长层次链上流动。然后，重点介绍了附加值和复杂性较高的产品的流动网络，如指数较大的机械和运输设备。这些值越高，表明它们的贸易流网络层次越高。因此，在没有全球投入产出表等额外数据的情况下，我们可以通过贸易网络识别出更复杂的产品类别，以及一个国家在全球价值链中的相对重要性。
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分类信息：

一级分类：Quantitative Finance        数量金融学
二级分类：General Finance        一般财务
分类描述：Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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一级分类：Physics        物理学
二级分类：Physics and Society        物理学与社会
分类描述：Structure, dynamics and collective behavior of societies and groups (human or otherwise). Quantitative analysis of social networks and other complex networks. Physics and engineering of infrastructure and systems of broad societal impact (e.g., energy grids, transportation networks).
社会和团体（人类或其他）的结构、动态和集体行为。社会网络和其他复杂网络的定量分析。具有广泛社会影响的基础设施和系统（如能源网、运输网络）的物理和工程。
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