Purchasing Managers' Index

Purchasing Managers' Index
Name	Purchasing Managers' Index
Abbreviation	PMI
Type	Economic indicator
Developer	Markit Economics; Institute for Supply Management
First published	1948
Related	Manufacturing PMI; Services PMI; ISM Manufacturing; Caixin
Territory	Global

Purchasing Managers' Index The Purchasing Managers' Index is a diffusion indicator compiled from monthly surveys of purchasing managers at private-sector firms, produced by organizations such as Institute for Supply Management, IHS Markit, Caixin, CIPS and national Chambers of Commerce; it is widely used by institutions including the Federal Reserve System, European Central Bank, Bank of England, Bank of Japan and International Monetary Fund for monitoring activity. The index aggregates responses on new orders, output, employment and supplier deliveries, and is referenced in analyses by entities like Bloomberg L.P., Reuters, The Wall Street Journal and Financial Times. Central banks, sovereign wealth funds, investment banks such as Goldman Sachs, JPMorgan Chase, and asset managers such as BlackRock and Vanguard Group treat PMI releases as high-frequency signals alongside indicators from agencies like Bureau of Labor Statistics and Eurostat.

Definition and Calculation

PMI is defined as a diffusion index where readings above 50 indicate expansion and readings below 50 indicate contraction; this framework aligns with diffusion-index methodology used by National Bureau of Economic Research, OECD and historical indices like the University of Michigan Consumer Sentiment Index. Calculation converts categorical survey responses—"better", "same", "worse"—into a single numerical series via a formula employed by organizations including Institute for Supply Management and IHS Markit. The standard PMI formula weights the percentage of respondents reporting improvement and no change, similar to constructs used in indices published by Conference Board and Bank for International Settlements. Seasonal adjustment and diffusion-weighted averaging procedures follow statistical practices comparable to those used by Office for National Statistics and Statistics Canada.

Components and Subindexes

PMI comprises core components such as New Orders, Production (Output), Employment, Supplier Deliveries and Inventories; these subindexes echo categories in surveys by institutions like Federal Reserve Bank of New York, China Federation of Logistics and Purchasing, Japan Business Federation and German Chamber of Commerce and Industry. Additional subindexes include Prices Paid, Backlogs of Work, Export Orders and Input Prices, paralleling detailed releases from ISM Manufacturing, IHS Markit Manufacturing PMI, Caixin Manufacturing PMI and country-specific surveys by Confederation of British Industry. Composite PMIs combine Manufacturing PMI and Services PMI using weights based on sectoral contribution measures from national accounts compiled by IMF and World Bank.

Methodology and Survey Process

Survey methodology typically samples purchasing managers and supply-chain executives drawn from panels maintained by providers such as IHS Markit, Institute for Supply Management and Caixin, and follows protocols similar to those of statistical agencies like Statistics Netherlands and Australian Bureau of Statistics. Questionnaires focus on month-on-month changes in activity and use triage coding; response rates and panel composition are disclosed to varying extents by publishers including CIPS and national statistical offices like Istat and Statistics Korea. Data processing involves seasonal adjustment, reweighting and validation procedures resembling those used by Eurostat and Office for National Statistics, with releases timed for market impact windows alongside economic calendars maintained by Bloomberg L.P. and Thomson Reuters.

Interpretation and Economic Significance

Analysts interpret PMI readings relative to the 50 threshold and track trends, momentum, and diffusion to assess business-cycle turning points identified by institutions like National Bureau of Economic Research and Bank for International Settlements. PMIs correlate with official measures such as industrial production, purchasing data from the Bureau of Economic Analysis, and employment figures from the U.S. Bureau of Labor Statistics, and are incorporated into nowcasting models employed by Goldman Sachs, Morgan Stanley, Deutsche Bank and research units at the European Central Bank. Policymakers at central banks including Federal Reserve System, Bank of England and Swiss National Bank monitor PMI shifts as timely indicators of inflationary pressures and demand conditions alongside indicators such as the Consumer Price Index and Producer Price Index.

Variants and Regional PMIs

Prominent variants include the ISM Manufacturing PMI, Markit Manufacturing PMI, Caixin PMI and sectoral PMIs for Services, Construction and Composite activity; national versions are produced for economies including the United States, China, United Kingdom, Germany, Japan, India, Brazil and South Africa. Regional PMIs cover metropolitan or provincial areas with examples like the Beijing PMI, Shanghai PMI, Caixin China General Manufacturing PMI and surveys run by regional bodies such as Confederation of Indian Industry and Federation of Indian Chambers of Commerce & Industry. Academic studies compare cross-country PMI measures alongside indicators from World Bank datasets and harmonized statistics in the IMF World Economic Outlook.

Historical Development and Criticisms

Origins trace to postwar business surveys and early diffusion indices used in studies by University of Michigan researchers and sectoral inquiries by organizations like American Management Association; the modern ISM PMI series dates to 1948 while vendor-based Markit series emerged in the 1990s. Criticisms target sampling bias, representativeness, sensitivity to questionnaire wording and reliance on qualitative responses—issues debated in journals such as Journal of Economic Perspectives, The Economist and papers from National Bureau of Economic Research. Methodological revisions and reconciliations with hard data have involved collaboration among Institute for Supply Management, IHS Markit, academic centers at London School of Economics and Columbia Business School, and standard-setters including International Organization for Standardization in related survey practices.

Use in Forecasting and Financial Markets

PMI releases move asset prices in bond, equity and currency markets and are incorporated into short-term forecasting models used by investment banks like J.P. Morgan, Citigroup, UBS and asset managers including BlackRock; algorithmic traders and hedge funds at firms such as Renaissance Technologies and Two Sigma use PMI-based signals in event-driven strategies. Econometric models combine PMI with macro variables from Bureau of Economic Analysis, Eurostat and Federal Reserve Board data to forecast GDP growth, industrial production and inflation; central banks and ministries of finance in countries such as Germany, France and Italy use PMI trends in policy deliberations. Market commentary on PMI outcomes is routinely published by outlets like Reuters, Bloomberg L.P., Financial Times and CNBC.

Category:Economic indicators