What happens when a leading conservative economist goes mano a mano with today's most influential exponent of left-liberal economics, over free markets versus government interventionism? Here are highlights of that showdown between Stephen Moore of the Heritage Foundation and Paul Krugman, Nobel laureate.

Moore and Krugman sparred over eight major economic issues in our national debate - from whether the policy response to the crisis of 2008 was successful, to the outlook for Obamacare, to the "red state / blue state" divide. The contest was cordial and spiced with wit. (Does air...