- Jun 4, 2004
- 16,849
- 13,784
- 146
From the WSJ article
The first time that jumps out is the time difference between the two groups. Mortgage rates have been declining since the 80s by around 0.25 to 0.375 per year and in particular the average 30 year fixed mortgage rate in 2010 was 4.69 and 4.45 in 2011 (source: http://www.freddiemac.com/pmms/pmms30.html ). Now that 0.24 decrease doesn't sound like much but it would allow a person making $55,000/year buy $5,000 more expensive home with no increase in monthly payment. So the falling interest rates could explain all of the increase in mortgage debt.
For the consumer debt, If they aren't taking on more credit-card debt, second mortgages or installment loans, then there is only two big categories left, student loans and auto loans. Assuming the age profile of the hires doesn't change much from year to year, then the auto-enrolled group was born on average a year later than control group. This would implied that they went college a year later. The average debt of a students graduating from four-year colleges that has loans has increased by roughly a $1000/year and the percentage of students with loans has steady increased over the last 25 years. (source: https://ticas.org/files/pub/Debt_Facts_and_Sources.pdf) Auto loans, like the mortgages above, have also seen their interest rates drop, but because of the much short terms(3-6 years) this can only a explain a couple hundred bucks.
Now the article does state "After adjusting for differences in the economic cycle and in characteristics of the two employee groups, including education and salary levels", maybe the author did some corrections for these factors. The article implies that the study stripped difference the stock market performance for the 401K gain. But I have hard time coming up with a way to strip out the interest rate differences.
I believe this is the study, but I haven't read through yet.
https://scholar.harvard.edu/laibson/publications/borrowing-save-impact-automatic-enrollment-debt
Thanks for the complete summary!