Here is our monthly installment of Joseph E. Stiglitz's Unconventional Economic Wisdom column from the Project Syndicate  news series. Stiglitz is a professor of economics at Columbia University, and recipient of the 2001 Nobel Prize in Economics, is co-author, with Linda Bilmes, of The Three Trillion Dollar War: The True Costs of the Iraq Conflict.
By Joseph E. Stiglitz
NEW YORK – Striving to revive the world economy while simultaneously responding to the global climate crisis has raised a knotty question: are statistics giving us the right “signals” about what to do? In our performance-oriented world, measurement issues have taken on increased importance: what we measure affects what we do.
If we have poor measures, what we strive to do (say, increase GDP) may actually contribute to a worsening of living standards. We may also be confronted with false choices, seeing trade-offs between output and environmental protection that don’t exist. By contrast, a better measure of economic performance might show that steps taken to improve the environment are good for the economy.