A worker builds a Ford Focus at the Ford Motor Co.'s Michigan Assembly Plant December 14, 2011 in Wayne, Michigan.

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Editor's note: Jeffrey Miron is senior lecturer and director of undergraduate studies in the economics department at Harvard University and a senior fellow at the Cato Institute. Miron is the author of "Libertarianism, from A to Z."

Cambridge, Massachusetts (CNN) -- In a recent discussion of what his administration might accomplish, Mitt Romney claimed that "by virtue of the policies that we put in place, we'd get the unemployment rate down to 6%, and perhaps a little lower," over a period of four years.

Is this goal attainable?

It is. Indeed, it is not that tough a task. If the United States avoids new growth-retarding policies, such as the tax hikes scheduled for January 1, the economy's natural adjustments will lower unemployment substantially. These include downward adjustments in wages, reallocation of job-seekers from slower to faster growing sectors and regions, reduced in-migration plus increased out-migration, and withdrawals from the labor force.

Jeffrey Miron

These adjustments do not always work quickly or for everyone (not every former construction worker can become a computer technician). But history suggests the adjustments do occur, as they have since the recession began. Over the next four years, they will continue to lower the unemployment rate, if not to 6%, at least near that territory.

The more important task for either presidential candidate is restoring the economy to its prerecession growth path. Real GDP has historically grown about 3% per year, and major downturns have been followed by strong recoveries. Within two to three years, therefore, output is typically "back where it would have been."

In this recession, the rapid recovery phase has so far been absent; real GDP is still well below where one would have predicted pre-2008, and with average growth under 3% since the recession ended, the gap grows larger every quarter.

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Opinion: How to get fast GDP growth