But younger investors also might want to consider repaying at least some of their mortgage using money they otherwise would invest in bonds, simply because repaying the mortgage offers a higher rate of return than that available in the bond market.

WSJ: Upside: Pay Off That Mortgage Now!

Typically mutual funds is where we are looking at quite substantially right now for really one reason, and those tend to trend better with a lot less risk, so you know you can have market-like rate of return on high-yield-bond mutual funds with historically a third of the downside risk of the markets.

FORBES: 2 Dividend ETFs for a Risky Market

Typically, buyers of perpetual bonds receive a fixed rate of return but expect the issuer to redeem the bond after several years.

WSJ: Perpetual Bond Risk Rises With US Treasury Yields

If I can open a frozen yogurt stand for 10, 000 dollars and get a 10% rate of return, then I will prefer the yogurt stand investment to a bond of similar risk which is offering 6%.

FORBES: Interest Rates Are What Unite Economics And Finance