Upper-middle-income countries, also known as industrializing or developing countries, are those that achieve the highest rates of economic growth and are also collectively referred to as Newly Incoming Economies or NIEs.

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Upper-middle-income countries are not necessarily the same as Newly Industrialized Economies (NIEs). NIEs are a subset of countries that have moved from developing to more industrialized economies, but not all upper-middle-income countries are classified as NIEs.

Upper-Middle-Income Countries, Also Known as Industrializing or Developing Countries, Are