BossTamsin (imported) wrote: Fri May 06, 2011 4:04 pm As well, it should be mentioned that correlation does not imply causation.
No, more like linkage.
Moi
BossTamsin (imported) wrote: Fri May 06, 2011 4:04 pm As well, it should be mentioned that correlation does not imply causation.
bobover3 (imported) wrote: Fri May 06, 2011 2:40 pm Well, we know how you feel. That's nice. But this isn't about feelings.
bobover3 (imported) wrote: Thu May 05, 2011 11:45 pm Here are the facts -
First, US median income for people 15 and older in constant 1997 dollars. (Source: US Census Bureau. See http://www.census.gov/prod/3/98pubs/p60-203.pdf Data is available from 1947 to 1997.) Second, top marginal tax rate. (Source: Tax Policy Center. See http://www.taxpolicycenter.org/taxfacts ... ?Docid=213).
In 1947, median income was $11,852. Top marginal tax rate in 1947 was 86.45%. In 1957, median income was $12,872, while the top tax rate was 91%. In 1967, median income was $15,223, and top tax was 70%. In 1977, median income was $16,327, and top tax was 70%. In 1987, median income was $17,100, and top tax was 38.5%. In 1997, median income was $18,756, and top tax was 39.6%. For intermediate years, see the Tables.
When I enter this data in a spreadsheet and calculate the correlation coefficient between median income and top marginal tax rate for these years, the result is -0.914. This is statistically significant. It tells us that a declining top marginal tax rate is strongly correlated with an increasing median income. Note that this is median income, not average, so that rich people will not have a disproportional impact on results.
These numbers suggest that declining tax rates played a role in increasing prosperity for ordinary people.
This may run counter to emotion and expectation, but there it is.
" I said the data show a significant correlation, making it difficult to claim that high
Also, the discussion is only about the top marginal tax rate, not all marginal tax rates. This is relevant to the debate about the effects of taxing the rich.
bobover3 (imported) wrote: Fri May 06, 2011 8:29 pm Dave, you can find my numbers on Table C-2.
I responded to A-1, who claimed that prosperity accompanied a top marginal tax rate of 91% under Eisenhower. This interested me, so I thought I'd check the facts.
Median income is relevant because it's unaffected by extremes, as average income would be. If median income in constant dollars is up, it means ordinary people are doing better, not just a few billionaires. Median income in constant dollars indicates the purchasing power of the incomes of ordinary people. I know of no more direct measure of prosperity.
I thought it best to look at individual income rather than the more frequently cited household or family income, because this gives a truer picture of what people are earning. Household income may appear to rise because more people, i.e., women, are working, creating dual income households.
My choice of 1947-1997 was dictated by A-1's reference to 91% tax rates, and by Census Bureau data, which was conveniently available for those years. If you will point me to similar data for 2007, I'd like to extend the analysis.
So, relevant to A-1's point, the data shows a strong negative correlation between top marginal tax rate and median personal income in constant dollars. This is correlation, not causation, as IEunuch points out. There were almost certainly other factors contributing to Americans' growing prosperity during these years. The data does seem to refute the idea that "we were well off when taxes were high, but we're poor now that taxes are low."