Constructing a portfolio based only on how financial assets will perform and behave ignores many of the investor's biggest assets: earning power, real estate and pension benefits such as social security.

That can lead to taking on too much or too little risk, resulting in higher volatility in wealth. Adjust for human capital and other types of non-financial assets and you will end up with a much different, and better mix based on your particular situation.

“The average person left to their own devices is blind to the kind of risk associated with human capital,” said David Blanchett, head of retirement research at Morningstar Investments. The traditional approach to diversification concentrates on how the performance and behaviour of different types of financial assets can interact within a portfolio. Hold bonds, for example, not because you think they'll outperform but because they serve as ballast, steadying the portfolio and allowing an investor to take on more risk and earn more reward than they might otherwise.

But to look at the risks and rewards of stocks, bonds and other financial assets in isolation ignores the often greater assets and more important risks that investors face.

Economist Gary Becker estimated that the value of human capital is at least four times that of all stocks, bonds, housing and other assets combined. That human capital, which in financial terms comprises our ability to earn income, has a different value and different risks at different points in our lives.

Asset allocation Take for example a 25-year-old. According to Blanchett and co-author Philip Straeh, 94 per cent of her total wealth on average is human capital, and just 1 per cent financial assets. Fast forward to the age of 60 and the typical person's wealth will be 20 per cent housing, 29 per cent pensions, 19 per cent financial assets and 31 per cent human capital. If your goal is lower volatility in total wealth, which is part of the point of diversification, then it becomes important to adjust where you put your money based on the value, and future value, of your other forms of wealth.

A younger person can take on more equity risk than an older one, who has less potential earnings, and less time to overcome career setbacks such as layoffs. The paper found that a 25-year-old's optimal allocation is 61 per cent equities, a figure that falls to 48 per cent at 45 and just 26 per cent at 65.

Housing : a fifth of the total wealth of the average 60-year-old. Housing too, can be a volatile asset. The study looked at optimal allocations for home owners in 10 major cities and found, unsurprisingly, that those who own real estate in volatile places should hold more cash and more bonds.

Jobs : work for the government and you can probably take on more investment risk than if you work in hospitality or lodging.

Diversify risks It makes sense for workers in industries to vary their allocations between equity sectors to diversify their risks. Work in manufacturing? You probably should have some extra commodities exposure as when raw materials go up in price your industry does poorly. Work in mining? Don't own mining stocks.

Much of this is what a good financial advisor should already be doing. It probably won't be too long before robo-advisors begin to offer adjustments based on these factors, even down to industry risk profiles.

Human advisors would do well to get a head start.

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