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by George Masnick
Senior Research Fellow |
Housing demographers are often frustrated by data that range from inconsistent to totally unavailable when attempting to research demographic and housing trends. The inconsistencies between various data sources on estimates of
household numbers and household growth,
vacancy rates, and
homeownership rates are well documented and continue to be dissected and discussed, but there are other metrics that have been even more elusive to pin down that would help enormously to better understand today’s demographic/economic trends and their housing implications.
Two broad areas of housing consumption are particularly
difficult to measure. The first concerns
the doubling up of generations living in a single residence. The second is the opposite – when a single household
lives in more than one housing unit on a regular basis.
We would like to be able to answer many questions about the
increasing trend of young adults who live with their parents. We have also identified
a growing trend of grandparents who live with their grandchildren (and in many
cases the grandchildren’s parent or parents as well) but we cannot identify
grandparents who might not live with their grandchildren but live close by and
provide support in childrearing. We
would like to know more about how delayed marriage/partnering, and divorce/remarriage,
affect housing consumption of multiple units.
For the most part, existing data cannot tell us what
actually takes place in the housing history of specific households over time as
individuals age and change their household configurations, marital/partnership
status, and employment/income profiles.
Most difficult to measure are the linkages between generations in
structuring patterns of geographic mobility (affecting both those who move and
those who do not move in order to be close to family), young adult household
formation, and housing consumption across the age spectrum.
Data sets that do have information about life-course
household transitions and some information about relationships between
generations rarely have any data on housing.
Data sets that have housing information lack information about
life-course changes preceding and during current occupancy. Information about extended family members
that do not reside in the household being interviewed is generally totally
lacking.
We would like to know not only how many adult children presently
live with their parents, but how many have boomeranged and the type of housing
boomerang children moved out of when they moved back home. How often does moving back
home occur for specific households, and how long does it last? Short spells of returning home presumably have
much different consequences than long ones.
Chronic returns might have very different causes and consequences than
one-off situations. Returns to large
houses with higher-income parents have different consequences than returns to
small homes having low household income.
We would like to know more about the background details of
children when they leave a parental household – reasons for leaving,
characteristics of housing (on both ends of the move), and, household size and composition
(again on both ends of the move). Are
boomerang kids and their household/housing characteristics different from those
who leave and do not return? This
information would be immensely helpful in better understanding the present and
future housing consumption of those Millennials who have been slow to form
independent households and become homeowners.
Ideally, answers to the kinds of questions just raised
require panel data that track individuals and their housing over time. The few nationally representative panel
surveys with public use micro data, such as the Panel Study of Income Dynamics
(PSID) or the National Longitudinal Survey of Youth (NLSY), have limited
housing data. And even these surveys have
historically been deficient on the collection of data on individuals and their
extended families: the PSID has collected data at regular intervals since 1968,
but only in
2013 added
a Family Roster and Transfer Module in which respondents and their spouses are
asked to enumerate all living parents and children over 18 and to report about
recent and long-term transfers of time and money to these individuals. The new PSID module is the first to fully
enumerate all biological, adopted, and step-relationships of parents,
parents-in-law, and adult children, and it is the first major data collection
effort on transfers of time and money in the PSID since 1988.
Other efforts to assemble panel data to directly study
co-residence patterns between adult children and parents, such as in a recent
Federal Reserve Bank of New York Report (utilizing its
own Consumer Credit Panel (CCP)) are neither a nationally representative sample
of all households nor available to other researchers, raising concerns about
the reliability of the data. For example, the CCP data set reports a much
higher rate of co-residence than other data sources such as the Current
Population Survey. Still, because of the
scarcity of panel data to answer some of our questions, data sets the FRBNY CCP
cannot be entirely dismissed.
Another reason for growing inter-generational co-residence
is the need to support and take care of grandchildren. Increasing grandparent-grandchild
co-residence certainly has important consequences for housing choices, further
postponing independent household formation among some Millennials, and perhaps delaying
downsizing among the Baby Boomer grandparents. We would like to know if older Americans who
live close to their grandchildren are different from grandparents who live with
their grandchildren. Do they also play
financial and childcare roles with respect to their grandchildren? Are retirees more likely to move to be close
to their children if their grandchildren are young? Does the existence of young grandchildren
make retirement moves that put greater distance between them and their grandchildren,
or that are to age restricted communities, less probable? Do older empty nesters with young
grandchildren actually downsize less than those with older grandchildren?
Available data on the
rise of co-resident grandparents and their grandchildren are mostly from cross-sectional surveys, like the
Current Population Survey, and are biased toward intergenerational families
where those in the first wave of Millennials had their children relatively quickly,
often while teenagers or still in school, or when not yet absorbed into the
labor force. Such early births are more
likely to be to parents without a college education and to be non-marital. The large and growing share of Millennials
who pursue higher education are more likely to
postpone childbearing (thus
postponing grandparenthood for many Baby Boomers) and their births are more
likely to be marital. Will first
grandchildren who come along later in life, when their parents are older and
more economically secure and their grandparents are more likely to be retired,
be more or less likely live with grandparents? Live close to their grandparents?
Unfortunately, nationally representative data that allow us
to identify who is even a non-coresident grandparent are practically
non-existent. The sole exception is from
the Survey of Income and Program Participation (SIPP), a longitudinal survey
following panels of households for 2½-to-4 years, which for three of its panels
has asked if a person has any biological children and if those children, in
turn, have any biological or adopted children.
The SIPP data overlook persons who are not biological grandparents but
are grandparents through marriage, either as stepparents themselves or who
became a grandparent when their children partnered with someone who already has
children, but has not adopted them.
Analyses of SIPP data on grandparents have been published
for the
2001 panel, the
2004 panel, and the
2008 panel. A 2014 panel is now in the
process of data collection. These data
estimate that there were 64 million grandparents in 2009 (second wave
questionnaire of the 2008 panel), of which one-in-ten lived with their
grandchildren. According to these data, only 22 percent of co-resident
grandparents were over the age of 70 compared to 34 percent of grandparents who
did not live with grandchildren. We have little insight into proximity of these
non-coresident grandparents to their children and the housing choices they have
made if they have recently moved.
One additional panel survey that collects data to answer
questions about grandparents is the
University ofMichigan’s Health and Retirement Study (HRS). It does allow identification of all grandparents,
co-resident grandparents, reasons for moving, and does have some housing data,
but it is somewhat limited by a sample design that selects particular birth
cohorts. Still, more analysis of these
data, collected annually from 1992 to 1996 and on alternate years since, can
help us better answer some of our questions.
Shifting gears, how people utilize multiple housing units
(their own and/or other’s) at different times during the week, month, or year
is almost a complete mystery. We would
like to know more about middle-aged and older people who sometimes dwell in two
or more housing units while maintaining control of each. There is a catch-all category of households
in some data sets identifying people who have a primary or usual residence elsewhere,
and this category has been growing in recent years. However, households interviewed at their
primary residence are not asked if they sometimes live in another home, and
data are not collected about the characteristics of that home and the reasons for
living in it. Are grandparents spending
some time living with their grandchildren on a regular basis, or buying or
renting a residence that they occupy occasionally to be close to their young
grandchildren? Are retirees who once
lived close by their young grandchildren retaining a previous residence for a
longer period of time to facilitate occasional visiting after retirement
migration? Are more adult children still
living in retirees’ previous homes after they retire and move elsewhere?
We would also like to know how long individuals maintain an
active consumption of multiple housing units when they change jobs or form new
relationships. Is “living together”
increasingly less a status and more a process that could involve two or more
housing units over an extended period of time?
Is the rise of long-distance telecommuting predicated on being able to
spend some time in two or more locations, and is it the case that housing units
in multiple places are owned or rented to facilitate this? If people are now better able to rent out or
share housing with others on a part-time basis (for example, through VRBO and Airbnb), are they more
likely to maintain multiple units for their own occasional use?
Until panel surveys from nationally representative samples
collect data on life-course transitions, on intergenerational relationships,
and on housing consumption more broadly defined, analysts will continue to try
to research trends with data that are usually inadequate to the task, and to have
questions that simply cannot be answered.