"Comprehensive Purchasing Managers Index (PMI) is one of the important indicators to measure the economic status of a country or region's manufacturing industry. It surveys the purchasing managers of manufacturing companies to reflect manufacturing production, new orders, employment, supplier transactions Changes in delivery time and inventory, etc. These data reflect the activity of the manufacturing economy and also have an impact on overall economic growth.

The Composite Purchasing Managers Index is usually calculated by surveying purchasing managers of manufacturing companies, collecting their opinions and expectations, and summarizing these data. The calculation method of the index is usually based on a dividing line of 50 points. An index higher than 50 indicates that the manufacturing economy is active, and a value lower than 50 indicates that the manufacturing economy is not active. In addition, changes in the index can also reflect the trend of the manufacturing economy. For example, an increase in the index indicates that the manufacturing economy is gradually becoming active, while a decrease in the index indicates that the manufacturing economy may face downward pressure.

The impact of the Composite Purchasing Managers Index is not limited to the manufacturing sector but has an impact on the economy as a whole. On the one hand, the active manufacturing economy will promote economic growth, stimulate employment, and increase government taxation. On the other hand, the economic inactivity of the manufacturing industry will affect the development of the entire economy, resulting in slower economic growth and reduced employment opportunities.

The Composite Purchasing Managers Index can also be used to analyze international markets, especially the investment decisions of multinational corporations. Since the comprehensive purchasing managers index can reflect the changing trend of the manufacturing economy, multinational companies can use the comprehensive purchasing managers index to judge the economic status of the manufacturing industry in the investment location and make corresponding investment decisions.

It should be noted that the comprehensive purchasing managers index can only reflect the changes in the manufacturing economy and cannot fully represent the status of the entire economy. Therefore, it should be analyzed together with other indicators to get a more complete picture of economic development. "