WORLD´S ECONOMY

https://www.investopedia.com/ask/answers/032515/what-are-best-measurements-economic-growth.asp

https://www.investopedia.com/ask/answers/062315/gross-national-income-gni-or-gross-domestic-product-gdp-better-measure-economic-condition-country.asp

https://www.investopedia.com/ask/answers/031715/how-does-united-states-government-measure-economic-growth.asp

https://www.investopedia.com/articles/investing/121213/gdp-and-its-importance.asp

https://www.investopedia.com/insights/worlds-top-economies/