Interest rate risk seems to puzzle some students when they first encounter it. It’s the idea that fixed-rate assets decline in value when interest rates rise. I’ve started using a simplified bond trading exercise to help students get the concept quickly. This is how it works.
Give A Student A Bond
I find a few victims/volunteers and give them brightly colored pieces of paper. These, I tell them, represent fixed rate bonds with a $10,000 value, paying 5% a year for the next twenty years. We run through some basic questions. How much money do they get each year ($500). How much money will they get if they hold the bond to maturity? ($20,000. This is the amount of the bond plus another $10,000 in interest). For the exercise, we keep it simple and just look at the cash flow coming off the one bond.
Change The Rates
After everyone gets the idea, I clap my hands and change the prevailing market interest rate from 5% to 8%. This leaves our initial volunteer holding a 5% bond in an 8% market. With a flourish, I pull out more brightly colored paper of a different shade and announce that I’m now
