Archimedes once said: Give me a fulcrum to turn the earth. If we compare the economic activity to the earth and economic policy to leverage, then the economic theory is the fulcrum that moves the "earth". For us in charge of economic work In terms of leading comrades, they deal with policies every day, or formulate policies, or implement policies, but if they do not master the necessary economic theory, they will inevitably disrupt the war. What does this text want to express most? ['The important role of economic theory in economic work.', 'Leaders in charge of economic work should have a certain economic theory.', 'Causes of economic work errors.', 'Leading cadres must learn to control economic work.']