Tyler Cowen and Ross Douthat Have Confused Delayed Childbearing with Declining Fertility

Ross Douthat’s recent New York Times column is based on the premise that “American fertility plunged with the stock market in 2008, and it hasn’t recovered.”  Douthat cited a Pew Research Center report that “the U.S. birth rate dipped in 2011 to the lowest ever recorded” because it fell to 63.2 per 1,000 women age 15 to 44 compared to 71 per 1,000 women in 1990.

Unfortunately, because of changes in the age distribution the average birth rate across all age groups from 15 to 44 is a poor way to compare birth rates over time; fertility rates vary among women of different ages.  For example, women age 15-19 and 40-44 have the lowest fertility rates.  In 2011 there are relatively more women in these age groups than in earlier years: 13% more than in 1990.  Changes in the age distribution distort comparisons of average birth rates between 2011 and earlier years. 

Demographers tend to use the “total fertility rate” to describe trends in birth rates over time.  The total fertility rate sums fertility rates across all age groups and therefore puts an equal weight on all ages from 15 to 44, regardless of changes in the age distribution.  The total fertility rate in 2011 is not the lowest rate ever recorded and is, in fact, higher than it was for the entire decade from 1975 to 1985.  This is why Carl Haub of the Population Reference Bureau wrote that reports claiming that the average birth rate in 2011 was the lowest ever are misleading.

Some demographers use the total fertility rate as a proxy for the expected number of children born to women over their lifetimes.  This approximation will only be accurate if women age 15-19 in 2011 expect to have the same fertility rate 15 to 20 years from now as women in their thirties have in 2011.  The approximation will be inaccurate if women in 2011 are delaying childbirth longer than women from earlier birth cohorts.

In recent years the biggest declines in fertility occurred for women under the age of 25.  In the past 20 years births to women age 15-19 are down 49% and births to women age 20-24 are down 26%.  At the same time fertility rates for women in their thirties and forties are higher than ever.  Since 2003 the fertility rate for women age 35-39 has been higher than for women age 15-19 and the gap is widening each year.  Similarly, beginning in 2009 the fertility rate for women age 30-34 increased above the rate for women age 20-24.  There is every reason to expect this gap to increase as women outnumber men in colleges and universities and account for 47% of the labor force.

Although it is likely that couples have delayed childbearing because of the economic downturn, there is no reason to assume that this will lead to a permanent decline in the number of children ever born to women over their lifetimes.  The total fertility rate has consistently underestimated the number of children ever born at times when young women are delaying childbearing longer than women from earlier birth cohorts.

The following charts illustrate actual birth rates for women born from the 1956-1960, 1961-1965 and 1966-1970 birth cohorts and the projected birth rates implicit in total fertility rate calculations made in 1975, 1980 and 1985 respectively (when women from these birth cohorts were 15-19).  For each cohort actual birth rates exceeded the projected rates based on older women in the corresponding cross-sections because younger women were delaying childbirth longer than women from earlier cohorts.  Birth rate projections from cross-section extrapolations are 10.9% to 13.3% lower than the actual number of children ever born to women over their lifetimes.  Birth_Rates1

Birth_Rates2

Birth_Rates3

Although women age 15-19 and 20-24 today may have lower fertility rates than their older sisters and mothers had at the same age, they are also likely to give birth to more children in their thirties and forties than their older sisters and mothers did.

Nonetheless, Tyler Cowen writes that he basically agrees with Douthat’s thesis that:

“The retreat from child rearing is, at some level, a symptom of late modern exhaustion – a decadence that first arose in the West but now haunts rich societies around the globe.  It’s a spirit that privileges the present over the future, chooses stagnation over innovation, prefers what already exists over what might be.”

An alternative view is that couples delay child rearing because they recognize that education and human capital investments are expensive and the economic downturn and weak recovery forestalled the important decision to start a family.  I believe the decision of a couple to wait until they can better afford the education, housing and health care costs for their children is a noble sacrifice rather than an expression of decadence or a choice of stagnation over what might be.

Comments

  1. Wonks Anonymous says:

    I had been under the impression that child rearing is not merely delayed, but reduced. The U.N, for instance, has said it expects the total world population to stabilize in the coming century as the demographic transition spreads. Women’s fertility drops as they age, so delaying childbirth would be expected to reduce total births as well.

  2. Compared to the peak of the subprime bubble, fertility among married American-born white women is down slightly. In contrast, it has collapsed among unwed foreign-born Hispanic women. Whether this represents a crisis is open to interpretation.

Trackbacks

  1. [...] and former chair of the University of Texas – Austin’s economics departments, argues convincingly that it’s [...]

  2. [...] earlier post on birth rates generated some interest and discussion and therefore deserves a bit more attention [...]

  3. [...] Even using the total fertility rate to calculate birth rates may be low-balling it. The best the TFR can do is anticipate how many children an average woman would have as she passes through all the years of her reproductive life, using the current rates of U.S. births for those various stages. But if more and more women have delayed childbirth over the last few decades, shifting the birth rate’s center of gravity to older women, then actual birth rates will be higher than what the TFR anticipates. In recent years, in fact, that’s exactly what’s been happening: [...]

  4. [...] earlier post on birth rates generated some interest and discussion and therefore deserves a bit more attention [...]

  5. [...] bearing enough babies. He is wrong on the stats. Stephen Bronars takes Douhat (and Tyler Cowen) to task, and digs more into the changes in women’s childbearing over recent [...]

  6. [...] an essay on his personal blog, he remarkable dual categorical factors that could cloud a correctness of a numbers. One is a [...]

  7. [...] reality, most of these selfish singles are in fact eventually getting married and having babies. They’re just doing it later. The result is that these selfish late procreators are wealthier, their marriages last longer and [...]

  8. [...] reality, most of these selfish singles are in fact eventually getting married and having babies. They’re just doing it later. The result is that these selfish late procreators are wealthier, their marriages last longer and [...]

  9. [...] It is not even clear right now whether fertility rates HAVE fallen significantly is ways that will matter over the long term, as Stephen Bronars points out. While I’m not sure I agree with his conclusion that younger women will eventually have more children than their older peers did, I do agree that it is too soon to jump to the conclusion that this trend will play out exactly as it has so far: [...]

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