The demographic transition, according to this analysis, is a shift from r-type to K-type behaviour.

ECONOMIST: Why, as people get richer, do they have fewer children?

If K-type behaviour is not delivering the goods then it should never have come about in the first place.

ECONOMIST: Why, as people get richer, do they have fewer children?

But there may be an explanation: that the psychological make-up which encourages K-type behaviour worked in the past but is not appropriate to modern circumstances.

ECONOMIST: Why, as people get richer, do they have fewer children?

Consider households headed by people aged 60 to 62, nearing retirement, with a 401(k)-type account at their jobs.

WSJ: Boomers Find 401(k) Plans Come Up Short

All current employees will no longer accrue defined pension benefits as of that date and will be forced into a 401(k)-type plan, as will new hires.

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Companies cutting back on 401(k)-type plans?

FORBES: Fact and Comment

Having tried and failed to get anywhere with incremental changes in recent years, Rhode Island will soon have a hybrid pension structure that puts the bulk of contributions into a 401(k)-type plan that public workers can take with them to other jobs.

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The solo 401(k) plan is not a new type of plan.

FORBES: Think About Going Solo In Your 401(k)

In the U.K., the Serious Fraud Office (SFO) has taken up a type of restorative justice in its penalty of defense contractor BAE.

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We need a new type of retirement account that is somewhere between a traditional pension and a 401(k) that combines some of the best features of each.

CNN: Hidden fees are eating up your 401(k)s