he said many times -- clearly and directly -- that if it continued more than 10 years or so it would destroy the middle class and eventually the whole economy.
I find it difficult to believe that either Reagan or Thatcher was aware of the long range consequences of supply-side stimulus combined with removal of most of the progressiveness in U.S. tax structure. If you could find a link to a quote, I'd be much obliged.
There is strong evidence that the inordinate, exponential growth of wealth disparity in the U.S (there are some lesser parallels in the UK due to Thatcher) is due primarily to a compounding over time of two factors. 1. Drastic collapse of the upper tax brackets combined with a raising of the marginal rate in the lowest bracket (i.e., the country was, at one point approaching a flat income tax in which nearly all of the progressiveness in the marginal rate structure had been wrung out, and 2. Taxing unearned income at lower rates than earned.
There are other factors as well, but those two factors mentioned above are major ones. This exponential wealth disparity growth is something peculiar to the U.S., and to a less extent the UK. You will see it when you look at other developed countries but to a much less extent.
The normal state of affairs in capitalist countries is for wealth to slowly accumulate at the top end of the wealth distribution. This is because the return on capital is greater than the growth rate of economy. This usual trend is, however, greatly exaggerated in the U.S., due mainly to tax policy. (Globilization is not a significant factor in acceleration of wealth disparity, however, and may actually be a useful counter measure.)
Sound microeconomic arguments are sometimes made based on particular industries, such as the off shoring of assembly line jobs, and the domestic replacement of workers via automation with the consequence that there has been little wage growth in the face of inflation and, at the low end, wages have actually declined in constant dollars.
These microeconomic components are contributing proximate causes of wage malaise among the labor class, but they are not the primary causes of the declining fortunes of the lower half of the middle class. A macroeconomic perspective is needed.
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N.B. Marx was hugely wrong, but not about everything. The results of his dictum that capital drives out labor are seen in our late 20th and early 21st Century U.S. economy.