What is Elastic perfectly plastic?

Why do many governments in countries with market economies control outlaw monopolies? Why does the government impose excise taxes? How do you calculate equilibrium level of output? How do you shift demand from real diamonds to CZ diamonds? Does the purchasing power of money decrease with inflation? What usually happened to sharecroppers who did make enough money from there crops to pay expenses? What is some professionals that provides goods for society's consumers? How much is a 10 pound British note worth in US dollars in April 2015? Why is barter important? What is the importance of peace for the development of a country? Suppose the elasticity of demand for cereal is 1 if cereal increases in price by 25 percent how much will the quantity demanded decreased by? How does innovations help the economy? What is the value of a 1943 25 US Savings Bond E Series? What is the history of international business? What are some common economics problems faced by developing countries? What is a tax paid on and real estate? What is the procedure for Supply of goods from eou to sez? Why are peanuts and rice called cash crops? What are the advantages of coins? Did slavery allow the South to enter into the new industrialized economies of the nineteenth century?