Average happiness score across 134 countries was 5.54 points in 2022. Finland ranked highest at 7.8 points, Afghanistan lowest at 1.86 points. Data available from 2013 to 2023
Physical stature varies significantly worldwide due to location, genetics, diet, healthcare, and socioeconomic status. Global average height difference is approximately 23.65 cm between tallest and shortest nations
GDP PPP per capita is total production divided by average population. 2023 global average GDP PPP per capita was $22,452. Calculations use international dollar with same purchasing power as US dollar
A millionaire is someone with net worth equal to or exceeding one million units of currency. The term was first used in French in 1719 to describe Mississippi Bubble speculators. The standard French spelling is now "millionnaire"
World Bank classifies economies into four income groups: low, lower-middle, upper-middle, and high. Classifications updated annually on July 1 based on GNI per capita. Atlas method introduced in 1989 for converting GNI to US dollars
Development status is determined by GDP, industrialization, and quality of life. UN uses Human Development Index (HDI) to assess social and economic development. No single metric is universally correct for developing vs developed countries