更改

A system of colors and sizing allows for simultaneous assessment of the network structure with other covariates. The nodes of the Product Space are colored in terms of product classifications performed by Leamer and the size of the nodes reflects the proportion of money moved by that particular industry in world trade. The color of the links reflects the strength of the proximity measurement between two products: dark red and blue indicate high proximity whereas yellow and light blue imply weaker relatedness.

A system of colors and sizing allows for simultaneous assessment of the network structure with other covariates. The nodes of the Product Space are colored in terms of product classifications performed by Leamer and the size of the nodes reflects the proportion of money moved by that particular industry in world trade. The color of the links reflects the strength of the proximity measurement between two products: dark red and blue indicate high proximity whereas yellow and light blue imply weaker relatedness.

颜色和大小的系统允许与其他协变量同时评估网络结构。产品空间的节点按照 Leamer 执行的产品分类进行着色，节点的大小反映了该特定行业在世界贸易中的货币流动比例。链接的颜色反映了两个产品间接近度测量的强度: 暗红色和蓝色表示高接近度，而黄色和浅蓝色表示较弱的关联度。

颜色和大小的系统允许与其他协变量同时评估网络结构。产品空间的节点按照 Leamer 执行的产品分类进行着色，节点的大小反映了该特定行业在世界贸易中的货币流动比例。链接的颜色反映了两个产品间接近度测量的强度: 暗红色和蓝色表示高邻近度，而黄色和浅蓝色表示较弱的关联度。

There are also other types of classifications applied to the Product Space methodology, as the one proposed by Lall which classificates the products by technological intensity.

There are also other types of classifications applied to the Product Space methodology, as the one proposed by Lall which classificates the products by technological intensity.

==Properties of the Product Space==

==Properties of the Product Space==