It is a popular view nowadays in academic that, developing countries should liberalize their policies which means to reduce state interventions given the process of globalization. As a matter of fact, many countries have followed this guidance, abating state intervention, privatizing public enterprises, deregulating the economy, and liberalizing foreign trade and capital flows, etc. The collapse of communism in East Europe is likely one of the most dramatic evidences for the trend. At the same time, the success of China’s economic reforms seems to be a further prominent demonstration for the appeal of free-market and private ownerships.
Population size fluctuates at differing rates in differing regions. Nonetheless, population growth is the long-standing trend on all inhabited continents, as well as in most individual states. During the 20th century, the global population saw its greatest increase in known history, rising from about billion in 1900 to over 6 billion in 2000. A number of factors contributed to this increase, including the lessening of the mortality rate in many countries by improved sanitation and medical advances , and a massive increase in agricultural productivity attributed to the Green Revolution .