The United Nations impressively has 193 states of nations in it's assembly, and they have a demographic, showing the nations of law standard of living according the the standard prepared by the Pakistani economist Mahbub-ul-Haq and the Indian economist Amartya Sen. It is called the Human Development Index. There are three variables listed as the following indexes: the life expectancy index, education index, and the Income index. Life expectancy is the average age lived by a person. Education is measured between the mean years and the expected years of education, and the income index is measured between a decent standard of income and the gross national income.
Since I visited China, Thailand, and Jamaica, I understood the currency exchange rate as an indicator of the comparison of nations. I see that compared to the United States currency is worth 1.28 times more than the euro currency, so I can think that the conditions comparing these nations. The US' condition is 1.28 times better then all of the EU. The conditions in China are 6 times worse than US. Thailand is 30, and Jamaica is 90 time worse condition wise. Imagining how a nation can be 90 times better is interesting, but comparing the US to Jamaica is a good indicator. Of course some nations manipulate the worth of their currency, so that it does not make sense like Japan. I don't know if people should interpret that the US' conditions are 80 times better than Japan; although, people can.
Now I have to interpret the HDI.
"It is used to distinguish whether the country is a developed, a developing or an underdeveloped country, and also to measure the impact of economic policies on quality of life....Over half of the world's population live in countries with "medium human development" (51%), while less than a fifth (18%) populate countries falling in the "low human development" category. Countries with "high" to "very high" human development account for slightly less than a third of the world's total population (30%)."
3h Agence France-Presse @AFP