Purchasing Managers' Index (PMI)

The Purchasing Managers' Index (PMI) is a leading economic indicator based on monthly surveys of purchasing managers at private companies. It assesses several variables, such as production volume, new orders, employment, inventory levels, and input prices.

The index oscillates around a baseline of 50 points:

• A reading above 50 indicates an expansion (growth) in economic activity compared to the previous month.
• A reading below 50 indicates an economic contraction.
• The further the reading moves above or below 50, the stronger the signal.

The index is published separately for the manufacturing and services sectors, and both are sometimes combined into a "Composite PMI," which provides a broader overview of the economy.

Why it matters to traders: The PMI is one of the most critical "leading indicators" because it is released relatively early (often within the first few days of the month), providing an early signal about the economy's direction before more comprehensive data, such as GDP, is published. It is also an essential tool for comparing the relative strength of different economies and anticipating the direction of their currencies.

Common mistakes:

• Focusing solely on the composite index without examining the individual breakdowns of the manufacturing and services sectors.
• Ignoring the difference between the flash (preliminary) and final index readings.
• Assuming that a reading above 50 always implies accelerating growth, whereas a reading hovering near 50 without improvement may simply indicate steady, slow growth.