Research the causes of related medical symptoms such as: 1  Mouth. 2  Mouth symptoms (6864 causes). 3  Mouth disease. 4  Mouth disorder. 5  Mouth pain (142 causes). 6  Ulcers (28 causes).
The most important measure of economic activity in a country, the Gross Domestic Product is the crossing point of three sides of the economy: expenditure, output, and income. As a measure of well-being of a country for international and temporal comparisons, it provides a good first approximation.
Intelligence, as measured by the tests, really does matter in both school and workplace, although it may matter in somewhat different ways than The Bell Curve suggests. To argue that IQ is a determinant of economic outcomes, Herrnstein and Murray relied on two sources of evidence.