daddybo said:
Do any of these politicians know about the "Laffer Curve" ?
While the general concept of the Laffer Curve is a decent idea, most people who invoke it are idiots.
(1) The Laffer Curve, for those who are unaware, is an upside-down U which represents the tax collected as a function of tax rate. At low tax rates, people produce a lot but you collect very little of it; at high tax rates, people lose incentive to produce. There is a maximum in the middle, representing an optimal tax rate.
(2) The Laffer Curve only supports tax cuts if it can be proven that the tax rate is above this optimal tax rate; if our tax rate is below the optimal, then the Laffer Curve would suggest we raise taxes in order to raise revenue.
(3) Experimentally, the Laffer Curve does not exist, or no country has a high enough tax rate to have actually reached said maximum.
(4) Graphs to the contrary are generally laughable, such as this one:
The authors have (correctly) plotted corporate tax revenues as a function of corporate tax rate for multiple countries, and then simply drawn a line through all the outliers. It's actually quite ridiculous, and as a general warning, this is representative of the level of scholarship that goes into such thinking.
(5) The same data fitted more reasonably looks like this:
This suggests that there is, at best, a shallow Laffer Curve with a maximum around a corporate tax rate of 25%, but this is statistically indistinguishable from a linear model which simply suggests that taxes collected are proportional to the tax rate (which would suggest that the Laffer Curve either doesn't exist or its optimal point is far to the right of the graph).
Over the past 100 years, there have been three major periods of tax-rate cuts in the U.S.: the Harding-Coolidge cuts of the mid-1920s; the Kennedy cuts of the mid-1960s; and the Reagan cuts of the early 1980s. Each of these periods of tax cuts was remarkably successful as measured by virtually any public policy metric.
Of course tax cuts are remarkably successful by public policy metrics.
(a) Tax cuts are generally made when things are going well; happiness is high, the economy is growing, and there aren't any emergency expenses.
(b) Reagan's tax cuts can be measured as successful because we haven't finished paying them off yet. Remember, fiscal conservatives argue for tax cuts alongside spending cuts - since the Reagan years, we have not had any spending cuts, so it's kind of silly to look at the Reagan tax cuts without looking what happened to the deficit.
Basically, when the Democrats are in power, it's tax-and-spend, tax-and-spend. When the Republicans are in power, it's don't-tax-but-spend-anyway.