"At current rates of economic growth"

Gregory Clark, in an otherwise sensible op-ed in today's LA Times (via Mark Thoma), makes this odd claim at the end:

Given that we can easily reduce consumption when costs go up, a permanent doubling of the prices of food and energy would reduce income by less than 6%. At current rates of economic growth, incomes would recover from such a shock in less than three years.

Call me crazy, but I think a permanent doubling of food and energy prices would slow our rate of economic growth pretty significantly. How long it would take incomes to recover "at current rates of economic growth" is irrelevant when the doubling of food and energy prices would lower the rate of economic growth.