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.
PRIMARY = #1 = is the most important factor, or has the most direct impact. SECONDARY = #2 = the next most important/direct .... TERTIARY = #3 = the third most ..... QUATERNARY = #4 = the fourth most ..... An economic sector is a certain type of business activity within an economy.