Most professionals need a significant amount of information in long term memory in order to complete their jobs successfully. Professional careers are part of a knowledge economy in which one is actually being paid for what one knows. For example, doctors need long term memories of anatomy, metabolism, and principles of diagnosing and curing diseases while lawyers need to know many legal precedents and principles. Although computerized databases contain vast amounts of information, these are not accessible unless you have general knowledge of what to look for. For example, a business person must know that many countries limit or regulate foreign direct investment before they are aware that they need to look up relevant laws before investing in that country.