Are Economic systems based on supply and demand?

What is the valu of the US dollar vs the British pound? What were the goals of the Khrushchev seven year plan? How does the supply of oil impact its price? What is the utility concept that economist use to measure? How can fixed costs be determined without considering variable costs? What is a ogree curve? What are examples for providing public services? Characteristics of newly industrialised countries? Will an economic problem arises when means and wants both are limited? What does global interdependence mean? What does a higher price for a good tell a producer? Advantage and disadvantages of bottom top participative budgeting? How does the circular flow model of a mixed economy compare with that of a market economy? Who is the pioneer of macroeconomics? What is the value of a 1981 twenty dollar estados unidos mexicano? According to Adam Smith individuals are directed to do those things for which they have a comparative advantage? How much is a 1000 Reichbanknote from 1922 worth now? Who are the countries that suffer with water scarcity? What do you call an agreement made between different companies to the same amount for product? What does the demand curve in the lower graph represent?