Tampilkan postingan dengan label maternity. Tampilkan semua postingan
Tampilkan postingan dengan label maternity. Tampilkan semua postingan

Selasa, 22 April 2014

Birthdays

American kids tend to be born June through September. I'd thought this was generally due to parents planning to hit a September school enrolment cut-off day: in many US states, if your child turns 5 at or before the start of school in September, the kid's enrolled; otherwise, you've got another year of daycare to worry about. Buckles and Hungerman showed that seasonality in births is due to deliberate timing: women who were trying to conceive showed strong seasonality, while those for whom births were unexpected showed no seasonality.

In New Zealand, your child starts school on the fifth birthday. If the child is born before a cut-off date (end-March, but later at most schools), he or she will start straight into Year 1. If the birthday is later in the year, the kid starts in Year 0 then either progresses to Year 1 at the start of the new school year in February, or continues in Year 0 until ready for Year 1. 

Incentives facing Kiwi parents are then a bit different. Since your kid is in school on the fifth birthday no matter what, you don't have to worry about hitting that barrier. But you might want to avoid a protracted stay in Year 0 unless you want your child to be old for his class. If you want to have your kid start straight into Year 1, you'd time your birth for the Kiwi summer or autumn; if you want your kid to start in Year 0 and dominate his later classmates on the rugby pitch, you'd time it for a spring Year 0 start. 

StatsNZ today put up a table showing the most common birthdays and linked to a great visualisation of the US data. In both cases, the heatmap shows the frequency of particular birth dates.

Here's the US:


And NZ:


 
Where Americans tend to be born June-September, Kiwi births cluster September-October. Those kids would get a short start in Year 0 before progressing to Year 1 when school starts in February. 

We hadn't really considered school timing when beginning the Ira and Eleanor production processes. I expect that the Kiwi data reflects deliberate timing decisions like those found in the US. I'm just a bit curious what's underlying those decisions. Kiwis avoid June the same way that Americans avoid January, but the only sense I can make for Kiwi preferences for spring over fall is differences in school timing. But there are disadvantages to being part of the cluster. Maternity wards have only so much capacity. If you're giving birth at the same time as everybody else, you're likely going to be pushed home rather more quickly than you'd like.

Pointers to the relevant literature, or Kiwi common knowledge, are welcome.

Senin, 27 Januari 2014

Moar kids

Overshadowed (predictably) by Lorde's Grammy wins was Labour's policy announcement. Should Labour form government, they'd like to pay parents $60 per week for the first year of the child's life. 95% of children are meant to be covered by the plan, which is not income contingent for the first $150,000 of family income but abates to zero immediately at $150,000. Parents of 2 and 3 year olds would also receive up to $60 per week. Those with family income less than $50k/year would receive the full $60/week for the extra two years, abating to zero by $80k annual income for those with one child and somewhat more slowly for those with two or three children.

The policy will likely increase fertility rates. We can look to two decent studies for evidence. First, Josh Gans and Andrew Leigh found that an Australian baby bonus programme induced a very strong timing effect: women delayed giving birth until 1 July, when the programme came into effect. This suggests that people do respond to these kinds of incentives, but it doesn't tell us whether the programme increased total fertility or just affected the timing.

Of more relevance for present purposes, Kevin Milligan found that Quebec's baby bonus increased fertility in Quebec relative to that in other provinces for the duration of the programme. For those without NBER access, here's the CD Howe summary. Canada's federal system provided him a nice way of running difference-in-difference to be able to infer causality. While the programme mostly paid families for children they would have had anyway, he did nevertheless find a substantial effect on fertility. He writes:
...the estimates suggest a strong, positive, and robust impact of the policy on fertility. In the model containing the full set of control variables, the fertility of those eligible for the new program is estimated to have increased by 12 per cent on average, and by 25 per cent for those eligible for the maximum benefit
As the Quebec programme's intention seemed to have been to produce more Quebecois,* Milligan figured out the cost per child-who-would-not-otherwise-have existed. It cost about $15,000 per additional child. Is that value-for-money? Depends what you think a child is worth. I think life is worth at least that much to each of the children who wouldn't otherwise be born, and that New Zealand is so far below optimal population size that it would be a bargain, if results here were similar.

Milligan also found some really interesting demographic effects.

Suppose your model of the world is as follows. Poorer people have lower IQ on average and are more likely to be income-constrained against having another child. We might then expect that a lump sum baby bonus, like Labour's, and like Quebec's, that doesn't scale with income, would differentially encourage poorer people to have more children. Then, this.

Milligan found instead that the greatest policy effect on fertility was in the middle income ranges - those earning $50,000 or so in Canadian dollars at the time. The poorest groups didn't see much fertility increase. Milligan speculates that the group either didn't know about the policy or were farther away from being at the margin where another child would be desired. There also was less fertility response among rich cohorts, for whom income would not have been the binding constraint anyway.

Some of the demographic separation could be due to the structure of the Quebec programme. After the programme was made a bit more generous in 1992, it paid $500 on the birth of a first child. The birth of a woman's second child also generated a $500 payment as well as another $500 on that child's first birthday. Things got far more generous for larger families: third and subsequent children drew twenty quarterly payments of $400 ($31/week) for a total of $8000. Milligan then, as expected, finds the largest effect on the likelihood of a woman's bearing a third or further child. Where the very poorest women cannot afford a first child, a $500 payment is unlikely to change things much. Only those who were more affluent to start with could afford to reach the hurdle necessary for accessing the payments for very large families.

We then shouldn't conclude that the differential fertility effect will necessarily hold under Labour's proposed scheme, which provides fairly generous payments for any newborn regardless of parity. As Labour's proposed payments for children after their first birthday abates quickly for families earning more than $50,000, we might expect a humped effect where there would be little effect on fertility decisions among the very poorest cohorts, rising effects up to $50,000, then attenuating effects thereafter. I wouldn't be surprised to see negative fertility effects in the upper-middle income cohorts due to income effects, but that would depend on how Labour finances the scheme.

The tldr; summary then:

  • Labour's programme is near certain to increase total fertility rates, regardless of how much snark leftie folks on Twitter want to throw around about "Oh, would you want to take care of my kid for $60 a week then?" They're nuts to suggest it won't happen. You don't need the programme to cover all the costs of child-rearing - you just need that some people had just barely decided against having a(nother) kid due to the cost and that these people change their mind under the new programme. I hate seeing tweets from people who know better pretending the opposite. You're not idiots - why pretend to be idiots on Twitter? Go read Kevin Milligan. 
  • We should perhaps worry less about "Oh, well, poor people are just going to have a pile of kids in order to draw the payments then, and anybody who'd decide to have a kid on that basis is exactly the kind of person who shouldn't be a parent." Milligan's results suggest that they don't, but we need to be very careful on that one as we just don't know what would have happened if the Quebec payments had been really generous for first and second children. It's possible that Matthew Hooton's right here and that there will be a strong fertility response among the poorest cohorts. 

Other observations:

  • Bill Kaye-Blake is right that the $150k family income cutoff is a bit odd
  • I would love to see somebody put together a new Effective Marginal Tax Rate schedule incorporating Labour's proposed changes. The abatement rates from $50k-$80k household income are pretty sharp. We'd also see a very large EMTR spike at $150k: the $1 that pushes you from $149,999 to $150,000 in family income will cost you $3120 if you have a newborn. 
  • Because of the large EMTR effect based on household income for those with newborns, I expect this will induce many second-earners, predominantly women, to spend longer outside of the labour force on the birth of a child. We'd see this in higher-earning couples, where the second-earner's income pushes family income above $150,000, and in middle-earning couples in the high abatement ranges. 
  • The plan's proposed extension of paid parental leave to 26 weeks will intensify the effect above. Consequently, small businesses may be more reticent to hire women of prime childbearing ages. The costs of bearing a half-year's likely leave are not trivial for employers. The wage gap will consequently increase. Sadly, National's jumping onto this bandwagon as well


* Milligan infers this from the increasing payment schedule. As there are economies of scale in child-rearing, a model designed simply to compensate for child-related costs would have a large payment for the first child, with lower payments thereafter. Political discourse at the time, if I recall correctly, was entirely pro-natalist. Citizens and Permanent Residents had access to the payments, immigrants who hadn't made PR weren't. Quebec nationalists later blamed "money, and the ethnic vote" for the failed sovereignty referendum; breeding more pure-laine was a potential solution.

Rabu, 23 Oktober 2013

Odd Japanese labour markets

Am I the only one who read the various stories on impending social collapse in Japan and reckoned there to be a potentially large opportunity for a firm that would be happy to hire women on flex-time arrangements?

Tyler pointed to one story yesterday; another hit the Washington Post today. Short version of both: Japanese labour markets are a disaster. Employers expect that a woman getting married has shifted to the mommy track and so pull her from opportunities for advancement, because she's likely to leave work after childbirth. And they're not wrong: the Guardian story says 70% of women leave work after having had a kid. Women wanting to have a career then don't get married.

Suppose that were all that were going on. We'd then expect some clever firm would figure out that there are tons of qualified women itching to get back into the labour market on flex-time arrangements and would hire them on a compensation bundle including less salary, on-site daycare*, and flex-time. Further, the peculiarities of the Japanese labour market could really work to such a firm's advantage. If you expect that a firm will dump you post-kid, then you don't make relationship-specific investments with that firm pre-kid. If you expect that you can flip to a decent flex-time arrangement post-kid, you work much harder for the firm pre-kid. And while the "job for life" norm seems to be abating in Japan, I'd be surprised if it were less true there than elsewhere.

So, why isn't this happening? First explanation: work norms. Where everyone's expected to put in really long hours, and where a firm has a mix of 16-hr workers and 7.5-hr workers, there's really no choice but to sideline the 7.5-hr workers onto the slow-track. But surely that's somewhat question-begging: it seems pretty improbable that you get that more output from one worker on 16-hour days than from two workers each on 8-hour days (who are on the same hourly but different annual total pay). And even if the 16-hour worker is more productive than two 8-hour workers, you could then just pay the 8-hour worker proportionately less.

Next explanation: The Guardian says kids are unaffordable unless you're on two incomes, but it's impossible to be on two incomes. Tokyo's expensive, but it's not the world's least affordable place. Beijing, Rome, Mumbai, London and Paris all come out worse on this index. But, where that index is conditioned on disposable incomes, and where salaries are based on crazy-long hours, then affordability could be a serious issue for those wanting to move to sane work hours. Maybe this part starts sorting itself out as homeowners die off faster than houses depreciate. Housing prices then fall rapidly as supply starts exceeding the number of people.

I can imagine a story where tight space constraints in Tokyo combined with pretty strong work norms have folks bidding up housing prices until it's pretty tough to afford a spot big enough for a family without two incomes with long work hours. But that story then conflicts with survey data that has money and housing as trivial reasons for not marrying; the Post story reports instead that "Do not feel the necessity" and "Do not want to lose freedom or comfort" were the main reasons given by both sexes for not marrying. And wanting to enjoy hobbies or entertainment was a slightly more commonly given reason for not marrying than wanting to concentrate on work or studies.

Maybe we need a Japanese translation of Bryan Caplan's book on low-effort parenting. The integral under the kid marginal-benefit curve is a lot bigger if you figure out ways of continuing to enjoy freedom and comfort.

Update: Brennan MacDonald points out that visas for domestic guest workers are much more difficult in Japan than in Singapore; if it's much harder to get a nanny, then that too helps explain female labour supply differences.


* Daycare availability seems a serious problem.