In the world of investing, it seems most people’s energy is focused squarely on stocks. Massive amounts of research goes into stock investing every day and even casual investors have an incredible amount of information at their fingertips. Combine that wealth of data with a long term growth pattern in the stock market since 2009 that means anyone who has been in the market less than ten years has no recollection of a single meaningful bear market, and stocks are so ingrained on our collective investing consciousness that many people don’t give other assets a second thought.

As a result, while bonds were once staples of any self-respecting asset allocation lots of investors just aren’t into them like they used to be. Some of it is definitely recency bias, and I think another factor is that many people don’t truly understand how bonds work. But I’ll concede that the bond market is also different than it was more than a decade ago, and I can understand why people might think twice about relying too much on historical data. After all, bonds sound like awesome choices when they paid 10% interest, but consistent declining rates over time surely boosted any backtested numbers while depressing yields today to something a lot less desirable. So it’s no surprise that I see questions along this line all the time:

With record low interest rates today that are even negative in some situations, what’s the point of having bonds in a portfolio at all?

That’s a very good question. And the full answer is kinda complicated and includes some advanced finance mechanics that fly under the radar even for very experienced investors. But explaining complicated concepts is kinda my thing, so let’s talk about a little thing called bond convexity.