Originally posted by Darth Executor
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I agree that a larger labor pool competing for a fixed amount of jobs would cause inequality. So yes: At times where unemployment is high, I think we are likely to see inequality go up, because competition for jobs lowers wages. However, there aren't a fixed number of jobs. A higher population simply results in more total jobs. So immigration increasing the size of the labor market is not going to be a particularly great explanation because it also increases the size of the job market.
So looking at US unemployment rates:
The period 1940 to 1980 is not hugely different to the period 1980 to the present, and so can't really explain why income inequality has been increasing since 1980 but not prior to that.
I think calling New Zealand's policies "Reagonomics" is really stretching it, but sure.
According to this gap net migration does appear to have increased somewhat in NZ since the 80s, though it oscillates wildly in some years:
NZ inequality also doesn't appear to have risen at the same rate as the US.
I'm loathe to use a small country like NZ as a datapoint since I suspect your policies are as much driven by international reality as they are by its inhabitants' whims.
Let's use the UK instead then. Their income inequality spiked massively in the period 1985-1990 and has remained high but fairly level ever since:
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Their net migration was zero or close to it until 1994 when it shot up and has remained high since. So that's not a great explanation: The migration post-dates the massive spike in income inequality. What was happening in the UK in the 1980s that might be able to explain changes in wealth distribution? Answer: Thatcherism, the single biggest change in UK government economic policy from WWII until now (exactly like Reaganomics in the US, or Rogernomics in NZ) implementing neo-liberal economic policy in the UK.
Thus we see that in the US, NZ and the UK, a massive spike in wealth inequality correlates chronologically with the deliberate introduction of neo-liberal government policies designed to tax the rich less, globalize, deregulate, reduce union influence, open up the labor market etc, that were labelled Reaganomics / Rogernomics / Thatcherism after their instigators due to the fact that they were parallel contemporary movements all doing roughly the same things. Essentially, the deliberate introduction of neo-liberal economic policies in a systematic way to these Western countries as part of deliberate government policy is exactly the point at which wealth inequality suddenly spiked in those countries.
I totally agree that it is very reasonable to discuss which of the economic policies (eg globalization vs lower taxes on the wealthy vs undermining of unions) contributed the most to the rise of inequality. They are potentially hard effects to disentangle because they happened simultaneously in most western countries as part of the massive switch to neo-liberal economics.
Capital gains taxes (which is how people get really, really rich) have been fairly uniform, so his theory is unlikely.
Capital gains taxes address the first. Income taxes on wages address the second. I would personally tend to count capital gains taxes as a type of "income tax" more generally, since capital gains are a type of income, so if "income tax" includes capital gains tax then 'income tax' addresses both concerns. (I take it for granted that the tax rate on capital gains ought to be at least as high as the tax rate on wages.)
Capital gains taxes have slightly decreased over time. There was significant reduction of capital gains taxes in the 80s, and another significant reduction in the 2000s. So I don't think lower capital gains taxes are totally off the hook in terms of explaining increasing wealth inequality (blue line):
It's possible that income taxes helped "reduced inequality" by just leaving a handful of super-rich dynasties at the top and smacked everybody who's rich but not bill gates rich back into the middle class.
If they are useful to workers once the labour pool is limited again the workers will bring them back themselves.
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