By James Kwak
My Atlantic column this week is on a familiar theme: why don’t Barack Obama and Democrats provide an clear alternative vision to the Romney-Ryan state of nature, instead of slowly stumbling along in the Republicans’ wake? But it also brings up a question that I haven’t seen before.
The theoretical argument against higher tax rates is that it reduces the incentive to work because it changes the terms of the tradeoff between labor and leisure. That is, higher taxes reduce your effective returns from labor, while your returns from leisure remain constant, so you will substitute leisure for labor.
In the long term, however, real wages tend to go up; even in the past three decades, which have generally been bad for labor (and good for capital), they’ve gone up by about 11 percent. If tax rates remain constant, that should increase the effective returns to labor, causing people to substitute labor for leisure (i.e., work more). Put another way, you could increase tax rates and keep the tradeoff between labor and leisure constant.
I generally don’t buy these pure theoretical arguments, but my point is that if you believe that higher taxes reduce labor supply through the substitution effect, then you should acknowledge that the effect of higher taxes could be swamped by growth in real wages.