Abba Lerner was a very prolific economist, and his views were sometimes very thought provoking, but are they also correct? This volume includes three of his theories: The first is about how communist countries can catch up free market economy; The second is about how to improve trade deficit; The third is on how to pay import tariff. For the first question he recommended subsidy; For the second he suggested depreciation, except for a catch; For the third he claimed that paying by import or export goods is indifferent. This volume will prove: they were all wrong.