The term developed country is used to describe countries that have a high level of development according to some criteria. Which criteria, and which countries are classified as being developed, is a contentious issue and there is fierce debate about this. Economic criteria have tended to dominate discussions. One such criteria is income per capita and countries with high gross domestic product (GDP) per capita being described as developed countries. Another economic criteria is industrialization. Countries in which the tertiary and quaternary sectors of industry dominate being described as developed. More recently another measure, the Human Development Index, which combines with an economic measure, national income, with other measures, indices for life expectancy and education has become prominent. Developed countries being those with a high (HDI) rating. However, many anomalies exist when determining "developed" status by whichever measure is used.

Countries not fitting such definitions may be referred to as developing countries or failed states.

Similar terms

Terms similar to developed country include advanced country, industrialized country, more developed country (MDC), more economically developed country (MEDC), Global North country, first world country, and post-industrial country. The term industrialized country may be somewhat ambiguous, as industrialization is an ongoing process that is hard to define. The term MEDC is one used by modern geographers to specifically describe the status of the countries referred to: more economically developed. The first industrialised country was England, followed by Germany, France, the remainder of the United Kingdom and other Western European countries. According to economists such as Jeffrey Sachs, however, the current divide between the developed and developing world is largely a phenomenon of the 20^th century.

Definition

Kofi Annan, former Secretrary General of the United Nations, defined a developed country as follows. "A developed country is one that allows all its citizens to enjoy a free and healthy life in a safe environment." But according to the United Nations Statistics Division,

There is no established convention for the designation of "developed" and "developing" countries or areas in the United Nations system.

And it notes that

The designations "developed" and developing" are intended for statistical convenience and do not necessarily express a judgement about the stage reached by a particular country or area in the development process.

The UN also notes

In common practice, Japan in Asia, Canada and the United States in northern America, Australia and New Zealand in Oceania, and Europe are considered "developed" regions or areas. In international trade statistics, the Southern African Customs Union is also treated as a developed region and Israel as a developed country; countries emerging from the former Yugoslavia are treated as developing countries; and countries of eastern Europe and of the Commonwealth of Independent States (code 172) in Europe are not included under either developed or developing regions.