Inter-industry relationship is the first relationship to be studied in industrial economics, which mainly studies the distribution of resources among industrial structures. It is classified according to a certain principle.Intra-industry relations are the industrial economics we talk about in a narrow sense. The narrow industrial organization theory is to study the analysis of intra-industry relations and the distribution of resources within the same industry.Analysis of intra-company or intra-product relationships is the content of new industrial economics or value chain trade theory research. I divide it in two ways-- domestic and global, intra-company and intra-product.The industrial chain of the final product is the analysis area that most needs to be strengthened in industrial economics. Starting from the final product, strengthening the analysis of its industrial chain can not only overcome the macroscopic defects of industrial structure analysis, but also enhance the observation of the micro-relevance of the industry.
