Top stocks to invest in – Benchmarking Multi-Asset Portfolios: The Global Capital Stock



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This article was coauthored by Gregory Gadzinski, PhD, of the INSEEC Research Center at the International University of Monaco, and Andrea Vacchino of Panthera Solutions.


Multi-asset investing is nothing new.

William Sharpe first postulated that the market portfolio was the natural starting point in portfolio construction in 1964. The balanced portfolio, which held fixed proportions of bonds and equities, was another antecedent to today’s multi-asset portfolio.


With increased global access to various asset classes, multi-asset investing has entered the mainstream for certain second generation asset allocation methods — for multi-factor/multi-period models.

Constructing optimally diversified multi-asset portfolios is all the more critical for investors who follow the principles of such third generation asset allocation methods as adaptive asset allocation or adaptive risk management techniques.

Multi-asset investing’s growing popularity reflects these preferences: More than 14,000 multi-asset funds are offered in Europe alone.

Yet after all these years, the core question remains: How do you  know whether a multi-asset portfolio is worth the investment?

Observation vs. Opinion

Many institutions have policy guidelines based on their investment managers’ preferences and expectations about the risks and returns associated with each asset class.

Other institutional investors run peer-group comparisons with similar multi-asset managers or measure their portfolios against broadly defined total return indices.

But these are only work-arounds. No policy portfolio benchmark exists against which investors can measure their multi-asset investment strategy.

A hypothetical global index purist could simply buy all of the outstanding assets in the world. The resulting global market portfolio would include all risky assets in proportion to their market capitalization. The purist could then use this as a benchmark to compare strategies.

While this approach has an appeal, not all risky assets are investable or measurable. With publicly available financial databases, we can now compute a global investable market portfolio. Researchers at McKinsey Global Institute report built a “map” of global financial assets. However, their data incorporated only traditional financial assets, omitting alternative assets.

So other researchers went a step further and added real estate and private equity to their broader asset universe. But they only included investable assets, with their portfolio weights based on their assets under management (AUM).

One Step Beyond

Our calculations are the next logical stage in this evolution. Our springboard is the definition of “capital.”

Capital is “non-financial assets having a dual role in an economy, being both a source of capital services in production and a storage of wealth,” according to the United Nations System of National Accounts (UNSNA).

Thomas Piketty used a broader definition: He extended the concept of “storage of wealth” to financial assets and assumed “capital” to mean the stock of all assets held by private individuals, corporations, and governments that can be traded in the market regardless of whether these assets are being used or not.

By merging these two definitions, we developed a measure of capital stock that consists of quantifiable financial and non-financial assets.

As a selection rule, we include assets whose price information is public or can be calculated from global institutional databases. We exclude assets whose valuations depend on partial, non-transparent sources, that are not observable, or are based on non-replicable methodologies.

More precisely, we calculated the global market value of the following 11 asset classes from 2005 to 2015 as our proxy for the global market portfolio:

  • Public equities
  • Private businesses
  • Government securities
  • Financial institution bonds
  • Non-financial corporate bonds
  • Cash equivalents
  • Cash
  • Securitized loans
  • Non-securitized loans
  • Real estate
  • Land

Global Capital Stock 2005–2015

The following charts depict global capital stock per asset class during the decade in question in trillions of US dollars and as a percentage.


Global Capital Stock per Asset Class: In Trillions of US Dollars
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Global Capital Stock per Asset Class by Percentage

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The world’s global capital stock reached $512 trillion in 2015, down from $517 trillion in 2014. The largest component? Debt, at $194 trillion, which grew without interruption until 2014. Non-financial corporate bonds showed the largest increase in 10 years.

Private businesses were worth $100 trillion in 2015, while public debt stood at $95 trillion after five years of relative stability due to the appreciating US dollar rather than a decrease in public borrowing. Finally, equity holdings rose to an all-time high in 2015, maintaining a stable weight over the preceding three years.

Putting This Data to Use

So how can our findings be applied? On the buy-side, they can be used to:

  • Monitor multi-asset managers by benchmarking their holdings against the global capital stock components, and then discovering appreciated or unrecognized drifts.
  • Achieve a comprehensive understanding of the performance attribution of multi-asset strategies.
  • Construct portfolios with the global capital stock as the initial point of reference.

On the sell-side, they can be applied to:

  • Investment decision making (factor allocation)
  • Risk management (style drift, concentration risk)
  • Marketing and branding

Of course, our research does have limitations. Given the lack of data for non-financial assets, there is an intrinsic margin of error in our calculations of the global capital stock. But we are optimistic that further research will help close the data gap and reduce this margin of error.

Our research in “The Global Capital Stock: A Proxy for the Unobservable Global Market Portfolio” is an important step toward defining a reliable benchmark for multi-asset portfolios. We will continue our efforts to develop more accurate measures. In the meantime, we invite you to explore our methods in more detail.

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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/erhui1979

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