The index-based ETF investment craze continues to lead to distortion in financial markets. Many investors are buying funds without fully understanding the risks.

The risk of large-cap equity indices has increased over recent years as a handful of the marketโ€™s most expensive shares have become such a large portion of the index. The risk of bond index ETFs has also increased.

The chart below shows that the duration of the Bloomberg Barclayโ€™s U.S. Aggregate Index has increased 20% over the last five years and 35% since 2009. Duration is a measure of interest rate risk. The higher the duration of a bond portfolio, the bigger the price drop for a given change in interest rates.

If you are still indexing the bond component of your portfolio via ETFs or mutual funds, it may be time to take a more tailored approach.