
Source: topincomes-parisschoolofeconomics
One reason why the top 10% in New Zealand have been a pretty ordinary lot compared to the USA is New Zealand’s university graduate premium – the college premium as it is known in the USA – is at the very bottom of the OECD ladder at about 18% – rock bottom 32nd out of 32 – the wooden spoon.
The College premium in the USA is about 64%, as shown in the OECD data below from OECD Education at Glance. Naturally, this high College premium in the USA should show up in well educated, highly skilled people earning a lot more than those that don’t go to college and don’t go to graduate school.

Stats link: http://dx.doi.org/10.1787/888932460515
Little wonder that the USA top 10% are breaking away from the pack. This slow increase in the income share of the top 10% since the early 1970s coincided with large numbers, including many more women in long duration professional degrees, going to university.
Prior to the mid-1970s, the College premium in the USA had been falling for about a decade because of large numbers of people going on to College and many of these two graduate school to get a draft deferment.
People married younger then so by the time people were at the end of College or graduate school, they were usually married with children and got of further draft deferment and aged out of the draft system.
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