Gross domestic product
Gross domestic product (GDP) is a monetary measure of the market value of all the final goods and services produced in a period of time, often annually 
GDP (nominal) per capita does not, however, reflect differences in the cost of living and the inflation rates of the countries; therefore using a basis of GDP per capita at purchasing power parity (PPP) is arguably more useful when comparing differences in living standards between nations.
BRIC
South Korea is one of the world's most highly developed countries and including it with developing countries like the BRICs is not deemed correct. However, commentators such as William Pesek from Bloomberg argue that Korea is "Another 'BRIC' in Global Wall", suggesting that it stands out from the Next Eleven economies with its BRIC-like growth rate, despite its Human Development Index being higher than some of the world's most advanced economies, including France, UK, Austria, Denmark, Finland and Belgium. South Korean workers are the wealthiest among major Asian countries, with a higher income than Japan and the strongest growth rate in the OECD. More importantly, it has a significantly higher Growth Environment Score (Goldman Sachs' way of measuring the long-term sustainability of growth) than all of the BRICs or N-11s. According to the IMF, South Korea's GDP measured by purchasing power parity is already larger than Canada and Spain. In terms of GDP per capita (PPP), South Korea overtook Spain in 2010. According to Citibank, South Korea will continue by overtaking Germany, Britain, Australia and Sweden by 2020, surpassing Canada, Switzerland, Netherlands and Norway by 2030 and taking over the United States by 2040 to become the world's wealthiest major economy. While measuring the South Korean economy by nominal GDP is inaccurate as the South Korean won is artificially kept low to boost exports, IMF predicts South Korea's nominal GDP and GDP per capita will surpass Spain in 2015. Economists from other investment firms argue that even when measured by nominal GDP per capita, South Korea will achieve over $145,000 in 2040, surpassing the United States, suggesting that wealth is more important than size for bond investors, stating that Korea's credit rating will be rated AAA sooner than 2050.