International Diversification for your financial portfolio
An investor can reduce risk exposure of your portfolio when the foreign assets have low portfolio correlation. This means that you own a portfolio of stocks that generally move independently of each other. When a market crashes, we can expect another market to crash less or even increase in value.
There are 2 components of risk in foreign assets. Firstly, there is volatility in the inherent asset. Secondly, there is risk in the foreign currency. These can be view positively as well. When one purchases an international stock, he may stand to gain from the asset capital gain and the currency gain.
Selecting global diversification is not an easy task. Generally, if you purchase assets from economies that are linked together or affected by the same factors, you have not diversified funds well. Buying stocks from the G7 exhibit high correlation and yield lesser diversification benefits.

Chart above shows that one can increase expected returns at the same risk level when one diversifies across international markets. One must be careful to note that naïve diversification across random nations do not yield adequate diversification benefits. An investor needs to determine specific asset correlation with the market and the contribution of risk to the portfolio.
Dealing with currency risk
Currency risk can be hedged away easily. If you buy US stocks, you can hedge by selling an equal amount of US dollars to hedge the dollar exposure. However, if you hold many foreign stocks, currency risk can be similarly diversified away in a portfolio comprising several currencies. This is an additional benefit of portfolio international diversification.
Long term trend of diversification
There are existing criticisms for international diversification. Some say that the global economies have integrated into one economy. If so, diversification benefits are eliminated automatically. There is no difference investing in Singapore, China or the US.
Why would critics say so? Firstly, free trade has increased. Economies depend on each other. Capital markets have globalized and corporations are no long localized. Mobility of individual capital has increased tremendously.
However, the truth is somewhere in between. Diversification strategies continue to be used by professional money managers. As an individual, we should adopt international diversification of our money to ensure lower risk for same amount of expected returns.
Alex Lew
Alex is the Vice President, Society of Financial Service Professionals (Singapore) and a Certified Fraud Examiner