I think he is right. This is basically modern portfolio theory. You should hold an optimal mix of assets, but you can hold negative quantities. If money is a b

I think he is right. This is basically modern portfolio theory. You should hold an optimal mix of assets, but you can hold negative quantities. If money is a bad way of keeping value (bad banks! Inflation! Money printing!....) then holding a negative amount (debt) and putting it into other parts of your portfolio is a good idea. A really a basic idea, with a solid mathematical foundation. I can highly recommend the first week of financial markets on coursera if you want to see a not so controversial introduction to this concept. The only problem is that it adds risk (swings could become larger than your net worth, which can mean bankruptcy)