by Calculated Risk on 12/29/2017 10:01:00 AM

Earlier I posted some questions for next year: Ten Economic Questions for 2018. I'm adding some thoughts, and maybe some predictions for each question.

9) Housing Inventory: Housing inventory declined in 2015, 2016 and 2017.  Will inventory increase or decrease in 2018?

Tracking housing inventory is very helpful in understanding the housing market.  The plunge in inventory in 2011 helped me call the bottom for house prices in early 2012 (The Housing Bottom is Here).  And the increase in inventory in late 2005 (see first graph below) helped me call the top for house prices in 2006.

This graph shows nationwide inventory for existing homes through November 2017.

Click on graph for larger image.

According to the NAR, inventory decreased to 1.67 million in November from 1.80 million in October.

Inventory has steadily been decreasing over the last few years.

This was the lowest level for the month of November since 2000.

Inventory is not seasonally adjusted, and usually inventory decreases from the seasonal high in mid-summer to the seasonal lows in December and January as sellers take their homes off the market for the holidays.

The second graph shows the year-over-year (YoY) change in reported existing home inventory and months-of-supply. Note: Months-of-supply is based on the seasonally adjusted sales and not seasonally adjusted inventory.

Inventory decreased 9.7% year-over-year in November compared to November 2016. Months of supply was at 3.4 months in November.

Note that the blue line (year-over-year change) turned slightly positive in 2013, but has been negative since mid-2015.

Two of the key reasons inventory is low: 1) A large number of single family home and condos were converted to rental units. In 2015, housing economist Tom Lawler estimated there were 17.5 million renter occupied single family homes in the U.S., up from 10.7 million in 2000. Many of these houses were purchased by investors, and rents have increased substantially, and the investors are not selling (even though prices have increased too). Most of these rental conversions were at the lower end, and that is limiting the supply for first time buyers. 2) Baby boomers are aging in place (people tend to downsize when they are 75 or 80, in another 10 to 20 years for the boomers). Instead we have seen a surge in home improvement spending, and this is also limiting supply.

The recent change in the tax law might lead to more inventory in certain areas, and I'll be tracking that over the course of the year.

I was wrong on inventory last year (and the previous year), but right now my guess is active inventory will increase in 2018 (inventory will decline seasonally in December and January, but I expect to see inventory up again year-over-year in December 2018).   My reasons for expecting more inventory are 1) inventory is historically low (lowest for November since 2000), 2) and the recent changes to the tax law.

If correct, this will keep house price increases down in  2018 (probably lower than the 6% or so gains in 2017).

Here are the Ten Economic Questions for 2018 and a few predictions:

• Question #1 for 2018: How much will the economy grow in 2018?
• Question #2 for 2018: Will job creation slow further in 2018?
• Question #3 for 2018: What will the unemployment rate be in December 2018?
• Question #4 for 2018: Will the core inflation rate rise in 2018? Will too much inflation be a concern in 2018?
• Question #5 for 2018: Will the Fed raise rates in 2018, and if so, by how much?
• Question #6 for 2018: How much will wages increase in 2018?
• Question #7 for 2018: How much will Residential Investment increase?
• Question #8 for 2018: What will happen with house prices in 2018?
• Question #9 for 2018: Will housing inventory increase or decrease in 2018?
• Question #10 for 2018: Will the New Tax Law impact Home Sales, Inventory, and Price Growth in Certain States?