The Ethics and Public Policy Center’s Jim Capretta—whose work on health reform I’m a huge fan of—weighs in on an aspect of the Social Security problem that’s received insufficient attention: falling fertility. Capretta argues that Social Security has stifled fertility in America, which in turn has stifled our ability to support the Social Security program. Steps to encourage higher fertility would make Social Security’s finances more sustainable over time. I’m not sure I agree with Jim’s argument on causation, but I think his policy prescriptions deserve more attention as we think about Social Security reform.
Capretta argues that “the presence of the state-based pension benefit—particularly if it is large—reduces the incentive of younger workers to have children.” The question is, why? Capretta’s answer is that
a motivation for having children in earlier times was economic security in old age. As parents became frail and less productive, it was expected that one or more of their adult children would take care of them. Married couples thus “invested” in numerous children, in part to ensure the next generation would have the economic capacity to provide for them in their final years.
Put another way, parents invested in “human capital”—that is, kids—as a way to save for retirement. With retirement income provided by the government, couples naturally would have less need to have children and fertility would decline.
I can buy this, up to a point. The problem is that, in the same period in which Social Security was developed and its benefits grew, a second innovation took place: it became far easier for individuals to save for retirement through financial capital, such as bank accounts, mutual funds, as so forth. In the 19th century many Americans didn’t really have access to modern forms of saving and so investment in human capital was a rational way to prepare for retirement. But as other saving opportunities arose, it’s likely that parents would substitute financial capital for human capital and reduce household sizes to levels desired for reasons other than retirement security.
If pension benefits were a main driver of fertility, you would expect that countries with relatively more generous pension plans would have lower fertility. Capretta cites research showing that countries that spend more on pensions as a share of GDP tend to have lower fertility. But that doesn’t necessarily show causality. Why? Because, in a pay-as-you-go program like Social Security, if fertility falls then the cost of pensions relative to GDP will rise. In other words, it’s not clear which is the chicken and which the egg.
I try to get around that problem by looking at the generosity of pension benefits from an individual perspective, measured by the replacement rate offered to the average retiree—that is, the pension benefit as a percentage of pre-retirement earnings. The higher the replacement rate, the less need to save on your own. As the chart shows, there’s really no relationship in OECD countries between the generosity of public pension benefits and fertility. Countries with very different levels of pension generosity can more or less have the same fertility rates. That’s not to say that a relationship is impossible at the margin, but it doesn’t appear to be a first-order effect.

However, there does seem to be a relationship between the generosity of pension and other government retirement benefits and ordinary saving. This paper by Jagadeesh Gokhale, Larry Kotlikoff, and John Sabelhaus attributes much of the decline in the U.S. saving rate to increases in Social Security and Medicare spending. They state:
Our findings are striking. The decline in U.S. saving can be traced to two factors: The redistribution of resources from young and unborn generations with low or zero propensities to consume toward older generations with high consumption propensities, and a significant increase in the consumption produce of older Americans. Most of the redistribution to the elderly reflects the growth in Social Security, Medicare and Medicaid benefits.
My takeaway from all this is that it’s likely that fertility would have declined regardless of the presence of Social Security simply as households shifted from saving in human capital (kids) to financial capital (stocks, bonds, etc). However, the significant increase in government spending on the elderly likely reduced saving in financial assets as greater retirement resources were generated on a transfer basis.
Yet, while I disagree a bit with Jim’s analysis of causes, I don’t really disagree with his policy prescriptions: even modest increases in the fertility rate would have a large impact on Social Security’s funding shortfall and a modest, but still significant, effect on Medicare and Medicaid funding. Increasing the fertility rate from 2.0 children per woman to 2.3 would cut the long-term Social Security shortfall by around 16 percent.
Capretta is also right that through Social Security, parents with children are effectively transferring resources to parents without children, and there is an argument, from a fairness perspective alone, for some compensation. A couple years back I ran some numbers on the value of an additional child to Social Security and came to a figure of around $22,000 in present value terms, although others convincingly argued it could be higher. Capretta argues for a reduction in the payroll tax rate for workers with children, which would simply pay that lump sum value out over time.
I also agree (as I argued in this 2008 AEI working paper) that automatic adjustments to Social Security benefits, based on changes in the worker/beneficiary ratio, could keep the program on a stable track with less political angst than the current approach.
The real question is how big an effect policy changes could have on fertility rates. A good chunk of payroll tax cuts for parents would flow to individuals who would have had children in any event, so the trick is in influencing behavior at the margin. Perhaps instead of a general payroll tax cut for all parents, maybe a large cut that kicked in at, say, the third child. But this is clearly an area that deserves more attention and it’s great that Jim has brought it more prominence.