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TL;DR: The PMI (Purchasing Managers' Index) is the fastest leading indicator for gauging manufacturing conditions. A reading above 50 signals expansion, below 50 signals contraction. Combined with the Industrial Production Index and export orders, it gives you a real-time pulse on the economy.

Concepts

What Is PMI? Why Is 50 the Dividing Line?

PMI stands for Purchasing Managers' Index. It is compiled by surveying manufacturing purchasing managers about their outlook on new orders, production, inventories, delivery times, and employment, then combining these into a single index.

PMI's greatest strength is its simplicity:

PMI > 50: Manufacturing is expanding; the economy is improving
PMI < 50: Manufacturing is contracting; the economy is weakening
PMI = 50: Flat -- neither expanding nor contracting

PMI is released quickly (data for the previous month is available at the beginning of each month), and it is a leading indicator that can signal turning points in the business cycle earlier than GDP.

In the U.S., the two major PMI readings are the ISM Manufacturing PMI (the longest-running) and the S&P Global Manufacturing PMI. Taiwan also has its own Manufacturing PMI published by the Taiwan Institute of Economic Research (TIER).

Industrial Production Index: Measuring Actual Output

If PMI is a "confidence survey," the Industrial Production Index is "hard data." It directly measures the actual output of factories, mines, and utilities. In the U.S., the series code is INDPRO.

Taiwan's Industrial Production Index is published by the Ministry of Economic Affairs. It is especially important for Taiwan because manufacturing -- particularly semiconductors and electronics -- accounts for a large share of GDP. When the index trends upward, it usually signals growth in both exports and corporate earnings.

Export Orders: A Uniquely Important Indicator for Taiwan

Taiwan is an export-driven economy, which makes "export orders" a critical leading indicator. Export orders reflect the dollar value of orders placed by overseas customers with Taiwanese manufacturers, typically leading actual exports by one to two months.

Export orders are highly correlated with the Taiwan stock market, especially for electronics and semiconductor stocks. When export order year-over-year growth turns positive or accelerates for several consecutive months, it often catalyzes gains in Taiwan equities, particularly in the tech sector.

The logic connecting these three indicators: PMI leads by reflecting confidence, export orders confirm demand, and the Industrial Production Index validates actual output. When all three are moving up together, it is a strong signal of economic recovery.

Hands-On: Using CTSstock

On the CTSstock homepage (/home), the economic indicators dashboard lets you track:

Taiwan and U.S. PMI: Updated monthly, providing a quick read on manufacturing conditions.
Industrial Production Index: Monitor trends in actual output.
Taiwan Export Orders: Gauge the direction of future exports and corporate revenue.

It is best to monitor all three together. If PMI has been climbing above 50 for several months, export order YoY growth has turned positive, and industrial production is also recovering, that is a strong signal the economy has bottomed out.

FAQ

Q: If PMI stays below 50 for several months, will the stock market definitely fall? A: Not necessarily. The stock market is a "game of expectations." Even if PMI is still below 50 but has rebounded from 45 to 48, it means the pace of contraction is slowing. The market may rally in anticipation that "the worst is over." The direction of change matters more than the absolute number.

Q: Why does the stock market sometimes not rise even when export orders are strong? A: Possible reasons include: the strong export data was already priced in; margins are being squeezed by currency or cost factors despite strong orders; or global markets are under pressure from other factors such as rate hikes or geopolitical tensions. No single indicator can fully explain stock market movements on its own.

Q: Is the Services PMI important? A: In the U.S., it is very important because services account for over 70% of the economy. In Taiwan, however, the Manufacturing PMI is more relevant because exports and manufacturing are the core drivers of the economy.