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Re:You can fool some of the people, all of the time by kbutler on Thursday November 07, 2019 @07:16PM (#21478899)
If I used to give 5% of income and now I give 15% of income, my commitment has increased, even if the need has also increased. 5% GDP to 15% GDP shows a pretty dramatic increase in commitment, especially with the economic growth in that time frame.

OP asserted "Post 1970s", so starting in the late 1970s is the appropriate starting point (quibbling?).

The progressivity rate link above was tax rate, not percentage of taxes paid.

Re:You can fool some of the people, all of the time by slg on Thursday November 07, 2019 @07:28PM (#21478976)
Let's say I paid $500 per month in rent a decade ago and today I pay $1500 in rent. What does that say about the quality of my home today compared to the quality of my home a decade ago? It says nothing because there are countless other details being ignored in that equation.

OP's point was that a change was made during the 1970s. You therefore need to look at the period before the 1970s and compare it to after the 1970s. You were just looking at the time period after the largest change in the top marginal tax rate was already made. Here[1] is the top marginal tax rate during a larger time frame.

[1] - https://commons.wikimedia.org/wiki/File:Historical_Marginal_...