1)      What is the necessity of comparing different countries or state?give 1 example of a recent model of comparision?   

Different countries in the world are compared in order to find the developmental rates of each country or a state. How can we find that which country has the highest percapita income or in which country the literacy rates are high? It is only by compariong various countries we come to know about which country offer better job opportunities or better working conditions. Based on the development reports also, many investors invest in the country which has better infrastructure, technology and have politically stable government.

Generally we use a model of comparison which uses per capita income of the country, the literacy rates and the general health levels of the people as the criteria for comparing the notion of development among the countries.