UBS's ($17.97 0.03%) Maury Harris, who is frequently recognized as the most accurate economist on Wall Street, shared an important chart with Business Insider when we had lunch with him last week.

It compares the year-over-year change in U.S. Federal government debt and home mortage debt for each year since the heyday of the housing bubble.

"Over the past six years, an around $1 1/8 trillion downsizing in per annum net home mortgage financing has accompanied an around $7/8 trillion upswing in federal borrowing per annum," said Harris.

In other words, the size of the mortgage bond market has shrunk by much more than the Treasury bond market has grown.