Part 7 · Connecting the economy to stocks · Lesson 34
Stock prices move before the economy does
When the economy is at its worst, stock prices are often already rising. Let's check with data the order in which stock prices and the economy pass their bottoms.
QToday's question
When the KOSPI hit bottom in March 2020, when did the economy hit bottom?
On March 19, 2020, the KOSPI fell to 1,457.64. But the official business-cycle trough set by Statistics Korea came two months later, in May 2020, and the month with the biggest job losses was January 2021. At the end of May, when the economy was at its worst, the KOSPI was already up 39% from its bottom. Why do stock prices move so early? In this lesson we follow the 'order of troughs' step by step.
MAPLearning map for this lesson
We build it up in three steps. At the end of each step, a 'Quick check' lets you test your understanding before moving on.
In Lesson 1 you learned that stock price = earnings × multiple; in Lesson 5 the four seasons of the economy and the official 2020 trough (May); and in Lesson 6 leading, coincident and lagging indicators. We will also build on priced-in expectations from Lesson 14, the 'gap versus expectations' from Lesson 20, and the finding from Lesson 26 that the KOSPI moved 3–4 months ahead of exports.
- STEP 1 · Basic conceptsStock prices trade the future
You will be able to explain the principle that stock prices move ahead of the economy because they reflect future earnings rather than today's business conditions.
- STEP 2 · Understanding the principleThe order of troughs
You will be able to explain how in 2008 and 2020 in the order stock prices → leading index → coincident index → employment, and also tell when stock prices give false signals.
- STEP 3 · Real-world applicationMeasuring the lag with 20 years of data
You will be able to overlay the KOSPI and business indexes, calculate the yourself, and set the order in which to read economic indicator news alongside stock prices.
STEP 1Stock prices trade the future
This is the first lesson of Part 7. Before connecting the indicators you've learned directly to stocks, let's confirm one fact you need to know first: stock prices and the economy do not wear the same watch.
Easy analogy · the front car of a train
Imagine a long train passing through a tunnel. The front car enters the darkness first, and it comes out into the light first. People in the rear cars are still in the dark while the front car is already in sunlight. The stock price is the front car of the train called the economy. While the rear cars, like factories and jobs, are still inside the tunnel, the stock price is already looking outside and moving.
A stock price is the price of 'future earnings'
In Lesson 1 you learned that stock price = earnings × multiple. The earnings here are not the money earned last year but the money expected to be earned in the future. Like the present value you learned in Lesson 17, the value of a stock is future earnings converted into today's value and added up. So the moment investors judge that 'the economy will get better in six months', stock prices start buying that future in advance, however bad today's economy is. This is exactly the effect from Lesson 14.
Economic indicators, on the other hand, record what has already happened. Industrial production, retail sales and the number of employed people tally last month's facts and are released a month or so later. The , which officially sets the peaks and troughs of the economy, is only confirmed years later. As you saw in Lesson 5, the May 2020 trough was only officially announced by Statistics Korea in March 2023. A lag is bound to arise between a market that trades the future and statistics that record the past.
2020: between two bottoms
Let's check with numbers. The KOSPI hit the bottom of the COVID shock at 1,457.64 on March 19, 2020. The official business-cycle trough set by Statistics Korea was May 2020, and the in the Bank of Korea's Economic Statistics System was also lowest in May at 96.3. Yet on May 29 the KOSPI was already up 39.2% from its bottom, at 2,029.60. Jobs lagged even more. According to Statistics Korea's employment trends, the number of employed people began to fall in March 2020, and in January 2021 it was down 982,000 from a year earlier, the biggest drop since the 1997 Asian financial crisis. At that time the KOSPI was hovering around the 3,000 level.
Quick checkOne day the headline reads 'Number of unemployed hits record high', yet the KOSPI rose the same day. Is that strange?
STEP 2The order of troughs
Was it only like that in 2020? Let's put two crises in which the economy fell sharply side by side and check the order in which they passed their bottoms.
Order of troughs: stock prices → leading index → coincident index → employment
When the economy climbs out of a recession, stock prices generally bottom first, followed by the leading index, the coincident index (the official business-cycle trough), and finally employment recovers. This puts stock prices at the very front of the leading, coincident and lagging indicator order from Lesson 6.
1. Stock prices
They price in future earnings in advance. They bottom first.2. Leading index
A bundle of indicators, like orders, inventories and sentiment, that point a few months ahead (Lesson 6).3. Coincident index
Shows the economy right now, like production and sales. Almost the same as the official trough.4. Employment
Companies only hire again once they are confident. The slowest to recover.See it as a picture: the order of troughs in 2008 and 2020
Press 'Next step' and the troughs appear one by one. Tap a dot to see the number at that time. The gray line is the KOSPI month-end close over the same period. Look at where the KOSPI was as each of the other indicators passed its bottom.
Sources: KOSPI from Naver Finance (month-end closes; daily closing lows 2008.10.24 938.75 and 2020.3.19 1,457.64); leading and coincident index cyclical components from Bank of Korea ECOS 901Y067 (I16E, I16D; raw data from the Ministry of Data and Statistics); official business-cycle troughs from Statistics Korea reference dates (2009.2, 2020.5); employment from Statistics Korea employment trends (Hankyung 2020.12.16: employment fell for 8 straight months in Jan–Aug 2009; Yonhap Infomax 2021.2.10: Jan 2021 −982,000). Checked 2026-10-05.
Both crises followed the same order. In 2008, after the KOSPI hit bottom at 938.75 on October 24, the cyclical component of the passed its bottom in January 2009 (97.1), and the coincident index cyclical component and the official business-cycle trough passed theirs in February 2009. The number of employed people only began to rise after falling for 8 straight months in January–August 2009. At the end of February 2009, the official trough, the KOSPI was already 13% above its bottom, and it rose 49.7% over the whole of 2009. In 2020, the same process happened much faster and more dramatically.
Three reasons stock prices move first
First, because expectations become prices. When millions of investors each forecast the future and trade, the average of those forecasts goes straight into the price. Factories and jobs only move once orders actually come in, but stock prices move on the mere judgment that 'orders seem likely to come in.'
Second, because policy moves first. When the economy deteriorates sharply, the central bank cuts interest rates and the government releases money (Lesson 13). When rates fall, the multiple grows even for the same earnings (Lesson 17), so the multiple knob pushes stock prices up before earnings recover. The rebound in stock prices right after the Bank of Korea and the Fed cut rates sharply in March 2020 is an example.
Third, because markets buy the moment the worst passes. What stock prices react to is not the 'level' of the economy but its 'direction' and the 'gap versus expectations' (Lesson 20). Even if the economy is still bad, stock prices rise once it starts to get less bad. Among investors there is a saying: 'Stocks climb a wall of worry.' It means that stock prices often start recovering just when bad news is overflowing and worry is at its greatest, and this is called the .
In Korea there is one more thing. As you learned in Lesson 6, the KOSPI is one of the indicators that make up Korea's composite leading index. In effect, the statistical authorities officially recognize stock prices as a 'number that shows the future in advance.'
Common misconceptions
- "It's not too late to buy after confirming the economy has improved?"
- At the end of May 2020, the official trough, the KOSPI was already 39% above its bottom. By the time you 'confirm' the recovery with numbers like the coincident index or employment, a large part of the rise has often already passed.
- "If stock prices fall, a recession must be coming?"
- Stock prices sometimes worry in advance about recessions that never come. The economist Paul Samuelson joked that 'the stock market has predicted nine of the last five recessions.' The KOSPI fell 24.9% in 2022 (Lesson 18), but a large part of that decline was the result of surging interest rates shrinking the multiple, not a correct call on a recession. Stock prices are a fast but often wrong signal.
- "Do stock market lows and economic lows happen on the same day?"
- In both crises, the stock market bottom came 2–4 months before the official business-cycle trough. This lag differs from crisis to crisis and cannot be known precisely in advance.
Quick checkList the order in which things passed their bottom in the 2008 crisis, earliest first: coincident index, KOSPI, employment, leading index
STEP 3Measuring the lag with 20 years of data
Two crises alone could be a coincidence. This time, let's measure for ourselves 'how many months ahead stock prices moved' using more than 20 years of monthly data. We'll apply the method we used with exports and the KOSPI in Lesson 26 to the business indexes.
Cross-correlation with lag: sliding the line to find the best fit
Overlaying two lines and then shifting one of them by a few months at a time to find the position where they fit best is called . If the correlation coefficient grows when you shift the KOSPI forward, it means the KOSPI moved that much earlier. Use the slider below to place the KOSPI line 0–12 months ahead and compare. The bars below show the correlation coefficient for each number of months.
KOSPI 1-year change vs. business index cyclical component (2005.1 ~ 2026.8, monthly)
Move over the chart to see that month's two numbers.
Sources: Bank of Korea Economic Statistics System (ECOS) 901Y067 composite business index, coincident index cyclical component (I16D) and leading index cyclical component (I16E); raw data from the Ministry of Data and Statistics. KOSPI 1-year change calculated from Naver Finance month-end closes. Some months in 2026 when the KOSPI 1-year change exceeds +120% are cut off at the top of the chart, but the correlations were calculated with the actual values. Correlations calculated by Robin Invest. Checked 2026-10-05.
The result is interesting. Comparing the same months, the correlation between the KOSPI 1-year change and the coincident index cyclical component is 0.02, which looks like almost no relationship. But the more you shift the KOSPI forward, the higher the correlation grows, peaking at 0.36 when it is placed 7–9 months ahead. Even excluding the extreme stock surge of 2026 and looking only through June 2025, the peak was 0.35 at 7 months. This means stock prices have moved roughly more than half a year ahead of the coincident economy.
Press 'Compare with leading index'. Even in the same month it is high at 0.65, and it peaks at 0.72 when the KOSPI is placed 2 months ahead. The leading index is a bundle of indicators that moves ahead of the coincident index, and the KOSPI itself is one of its components, so the two lines move much closer together. Still, the fact that the peak is at 2 months rather than 0 months shows that stock prices have moved a little ahead of even the leading index.
A correlation of 0.36 is only large enough to say 'they tend to move together to some extent.' As you learned in Lesson 1, besides business conditions (the earnings knob), interest rates and sentiment (the multiple knob) also act on stock prices, so business conditions alone cannot explain stock prices. In years like 2022, when interest rates dragged stock prices down, and 2026, when semiconductor earnings outlooks pushed stock prices up far more than the economy, the two lines diverge widely.
In practice: the order for reading economic indicator news
| News | Nature of the indicator | How to read it with stock prices |
|---|---|---|
| "Employment falls by the most on record" | Lagging | It is the result of an economy that has already passed. Stock prices may already be looking at the next phase. |
| "Industrial production and retail sales fall for a third month" | Coincident | It is the economy right now. If stock prices hold up even on this news, the market may be expecting a recovery. |
| "Leading index cyclical component rises for a sixth month" | Leading | It is the direction of the economy a few months ahead. Check whether it points the same way as stock prices. |
| "Manufacturing PMI recovers to 50, exports turn up" | Leading | A signal that the earnings knob is turning (Lessons 6 and 26). Whether it is better than expected is what matters (Lesson 20). |
| "Stocks plunge, recession fears" | Fastest, but often wrong | Check whether other leading indicators are also turning down. If stock prices are alone, it may be a false signal. |
You can see the current business-cycle and interest rate/exchange rate phase at a glance in 'Current phase' on the Macro Map, and check the schedule of economic indicator releases on the Calendar. Together with the finding in Lesson 26 that exports moved later than the KOSPI, you can sketch the big order 'stock prices → exports and leading index → production → employment.'
It is not always so. Correlations and lags are only historical averages, and the gap between troughs differed from crisis to crisis. The fact that stock prices move first does not mean 'you can call the bottom', and stock rebounds often turned down again. The content of this lesson is for education and is not investment advice.
Quick checkThe correlation with the coincident index was highest when the KOSPI was placed 7 months ahead. Can we say from this result that 'the economy 7 months ahead can be predicted precisely'?
✓What we learned today
- Stock prices reflect not today's economy but the earnings to be made in the future. That is why they tend to bottom and turn down before economic indicators.
- In 2008 the order was KOSPI (2008.10) → leading index (2009.1) → coincident index and official trough (2009.2) → employment recovery (2009.9), and in 2020 it was KOSPI (2020.3) → leading and coincident indexes and official trough (2020.5) → worst job losses (2021.1).
- At the end of May 2020, the official trough, the KOSPI was 39% above its bottom, and at the end of February 2009 it was 13% above. If you only move after confirming the economy has improved, it is easy to miss a large part of the rise.
- In the 2005–2026 data, the correlation between the KOSPI 1-year change and the coincident index cyclical component was 0.02 in the same month, but it was highest at 0.36 when the KOSPI was placed 7–9 months ahead (calculated by Robin Invest).
- However, stock prices sometimes worry in advance about recessions that never come. Signals from stock prices should be checked together with other leading indicators such as the leading index, PMI and earnings forecasts.
If stock prices move ahead of the economy, which 'sectors' move first when the seasons of the economy change? In the next lesson we turn the sector rotation clock, where the strong sectors take turns in each phase: recovery, expansion, slowdown and recession.
Quiz5-question quiz
Pick an answer and it's graded right away with an explanation.
Q1. What is the most fundamental reason stock prices move ahead of economic indicators?
A stock price is the present value of future earnings (Lessons 1 and 17). The moment investors judge that the future will improve, stock prices move first, regardless of today's economy.
Q2. Which is the generally correct order in which things pass their bottom as the economy climbs out of a recession?
In both 2008 and 2020, stock prices passed the bottom first and employment last.
Q3. At the end of May 2020, the official business-cycle trough (May), how much higher was the KOSPI than its March bottom (1,457.64)?
On May 29, 2020, the KOSPI was 2,029.60, about 39% above its bottom. By the time you 'confirm' the economic recovery, a large part of the rise had already passed.
Q4. In the 2005–2026 data, the correlation between the KOSPI 1-year change and the coincident index was 0.02 in the same month and 0.36 when the KOSPI was placed 7–9 months ahead. What does this mean?
The fact that past KOSPI values matched the economy a few months later better means that stock prices moved first. However, 0.36 is only the size of a 'tendency', so it is not a precise forecasting tool.
Q5. What does the joke 'the stock market has predicted nine of the last five recessions' teach?
Stock prices are the fastest leading indicator but are often wrong. That's why you need to check whether other indicators such as the leading index, PMI and exports are also turning down.
NextTerms · Next lesson · Related tools
The price at which one share of a stock trades in the market. Over the long run it is set by the earnings the company makes and the multiple (P/E) the market puts on those earnings.
Leading indicatorLeading indicatorAn indicator that moves ahead of the actual economy. Stock prices, the PMI and the term spread are typical examples.
Cyclical component of the coincident indexCyclical component of coincident indexThe coincident composite index, which bundles indicators that move with the economy such as production, consumption and employment, with its long-term trend removed. Above 100 means the economy is hotter than trend; below 100 means it is cooler.
Coincident indicatorCoincident indicatorAn indicator that moves at almost the same time as the economy. Industrial production, retail sales and the number of employed persons are typical examples, and they show 'the economy right now.'
Lagging indicatorLagging indicatorAn indicator that moves later than the economy and confirms the economy that has already passed. Korea's lagging composite index includes the number of employed persons, producer finished goods inventories, the change in service prices, and the CP yield.
Order of troughsOrder of cyclical troughsThe phenomenon in which, as the economy climbs out of a recession, things generally pass their bottom in the order stock prices → leading index → coincident index (the official business-cycle trough) → employment. This order also appeared in Korea in 2008 and 2020.
Cross-correlation with lagCross-correlation with lagA method that shifts one of two time series by a few months at a time and calculates the correlation coefficient to measure which one moved earlier and by how much. The lag at which the correlation coefficient is highest indicates the approximate lead time.
Wall of worryWall of worryA term that comes from the investing saying 'stocks climb a wall of worry.' It means that stock prices often start recovering just when bad news and worry are at their greatest.
Priced inPriced inA state in which something expected to happen is already reflected in prices such as stock prices or interest rates. If things happen as expected, prices do not move much.
RecessionRecessionA state in which economic activity such as output, income and jobs visibly shrinks for a considerable period. It is often described as 'two consecutive quarters of falling real GDP', but the official declaration takes multiple indicators into account.
Reference date of the business cycleReference date of business cycleThe official point in time when the economy hit a peak or a trough. In Korea, the statistics office (formerly Statistics Korea) determines and announces it a few years late, after the data has built up.
Unemployment rateUnemployment rateThe share of people who are willing and able to work (the labor force) but cannot find a job. It rises when the economy worsens.
This is educational material and not investment solicitation. There is no guarantee that past relationships will repeat in the future.