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Chinese and World Stock Market Co-Movements: Two Findings

China’s emergence as a global economy on the world stage is perhaps the biggest economic story of the last 30 years. During the last several decades, China’s industry has modernized, many of its tech companies have debuted on Chinese stock exchanges via initial public offerings (IPOs), and the nation’s markets and exchanges have opened to a stratum to overseas investors.

China has wilt increasingly and increasingly integrated into the world economy. Yet despite this trend, China’s stock markets still sometimes move in idiosyncratic ways relative to other world exchanges. Due to short sale constraints, among other features, China’s exchanges have sometimes been prone to widow volatility, with notable frothing and busts occurring on the Shanghai Composite Alphabetize in 2007 and 2015.

How then have the co-movements of China’s stock exchanges ripened over the last 25 years as the nation has wilt a greater presence in global markets?

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To wordplay this question, we examined how correlations between the two major Chinese exchanges — the Shanghai Composite Alphabetize and the Hang Seng — and their counterparts virtually the globe have evolved. Then we divided the time periods into three categories — 1997 to 2004, 2005 to 2014, and 2015 to present — to see what sort of pattern emerged over time.

We isolated two key findings.

First, the Shanghai Composite has wilt much increasingly highly correlated with the S&P 500 over the last quarter century. Between 1997 and 2004, it had a 0.08 correlation. In our most recent sample, the correlation coefficient soared to 0.47 and represents the greatest shift in co-movement over our unshortened study period.


Correlations: Shanghai Composite to S&P 500

August 1997 to December 2004 0.08
January 2005 to December 2014 0.35
January 2015 to Present 0.47

The monumental jump in Shanghai Composite co-movements is not isolated to the S&P 500. The correlation coefficients of just well-nigh all the exchanges virtually the world, plane the XLK US tech index, have all leaped with the Shanghai Composite between 1997 and the present. The one exception? Russia’s MOEX.

The question is why. What explains the increasing correlations?


Correlations: Shanghai Composite and the Hang Seng vs. Global Exchanges
August 1997 to December 2004

S&P
500
Nikkei Mumbai FTSE CAC
40
DAX MOEX TSX ASX
200
XLK
Shanghai
Comp.
0.08 0.14 0.16 -0.09 0.02 0.08 0.26 0.13 -0.06 0.08
Hang Seng 0.59 0.41 0.28 0.63 0.50 0.50 0.49 0.64 0.58 0.66

January 2005 to December 2014

S&P
500
Nikkei Mumbai FTSE CAC
40
DAX MOEX TSX ASX
200
XLK
Shanghai
Comp.
0.35 0.31 0.38 0.31 0.31 0.34 0.33 0.38 0.41 0.37
Hang Seng 0.72 0.59 0.76 0.72 0.66 0.68 0.66 0.70 0.73 0.67

January 2015 to Present

S&P
500
Nikkei Mumbai FTSE CAC
40
DAX MOEX TSX ASX
200
XLK
Shanghai
Comp.
0.47 0.47 0.32 0.33 0.36 0.42 0.18 0.38 0.32 0.44
Hang Seng 0.61 0.54 0.51 0.51 0.51 0.49 0.39 0.29 0.41 0.55

We believe it comes lanugo to two factors or a combination thereof: the opening of China’s markets to the rest of the world and the growing presence of financial and tech stocks on the Shanghai Composite.


All Time Correlations: Shanghai Composite, the Hang Seng and Global Indexes

S&P
500
Nikkei Mumbai FTSE CAC
40
DAX MOEX TSX ASX
200
XLK
Shanghai
Comp.
0.28 0.30 0.30 0.25 0.21 0.25 0.25 0.29 0.26 0.25
Hang Seng 0.63 0.50 0.51 0.64 0.55 0.56 0.50 0.64 0.58 0.61

Our second hair-trigger takeaway is that Shanghai Composite increasing correlation with world markets is not reflected on the Hang Seng. Global indexes have historically had greater correlation with the Hang Seng, but co-movement between it and other exchanges has not increased all that much over the last quarter century. The S&P 500 had a correlation coefficient of 0.59 with the Hang Seng from 1997 to 2004. That has barely budged. Since 2015, it has stood at 0.60.

Tile for The Emerging Asia-Pacific Capital Markets

All told, China’s emergence on the world stage has shifted correlations wideness its stock markets. The Shanghai Composite is now much increasingly correlated with global markets, having nearly doubled its correlation coefficient in just 10 years.

No similar trend has emerged on the Hang Seng, however. It’s correlation with most world exchanges has barely budged over the past 25 years. 

Whether these correlation trends protract in an era of increased geopolitical competition will be something to watch for in the months and years ahead.

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All posts are the opinion of the author. As such, they should not be construed as investment advice, nor do the opinions expressed necessarily reflect the views of CFA Institute or the author’s employer.

Image credit: ©Getty Images/Johannes Mann


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Derek Horstmeyer

Derek Horstmeyer is a professor at George Mason University School of Business, specializing in exchange-traded fund (ETF) and bilateral fund performance. He currently serves as Director of the new Financial Planning and Wealth Management major at George Mason and founded the first student-managed investment fund at GMU.

Juhee Hong

Juhee Hong is a senior at George Mason University pursuing her wifeless of science in economics with a minor in finance. She is interested in international economic minutiae and financial markets. At Mason, she is working as a teaching teammate for the financial management undertow and is looking forward to using her skills and knowledge in the finance industry without graduation.

AnhMinh Luu

AnhMinh Luu is a junior at George Mason University studying written and management information systems (MIS). At Mason, he works as a teaching teammate for FNAN 303 – Financial Management. Outside of Mason, he works as a finance and written intern at Chief Executives Organization. Following his graduation, Luu hopes to obtain his CPA license and work as a financial reviewer or written manager.

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