Question: What were the three largest economies in the world in 2018?

World economy



World economy
Africa
Americas
Central America
North America
South America
Asia
East Asia
Europe
Oceaniavt
The world economy or global economy is the economy of the humans of the world, considered as the international exchange of goods and services that is expressed in monetary units of account.[1] In some contexts, the two terms are distinguished: the "international" or "global economy" being measured separately and distinguished from national economies while the "world economy" is simply an aggregate of the separate countries' measurements. Beyond the minimum standard concerning value in production, use and exchange the definitions, representations, models and valuations of the world economy vary widely. It is inseparable from the geography and ecology of Earth.
It is common to limit questions of the world economy exclusively to human economic activity and the world economy is typically judged in monetary terms, even in cases in which there is no efficient market to help valuate certain goods or services, or in cases in which a lack of independent research or government cooperation makes establishing figures difficult. Typical examples are illegal drugs and other black market goods, which by any standard are a part of the world economy, but for which there is by definition no legal market of any kind.
However, even in cases in which there is a clear and efficient market to establish a monetary value, economists do not typically use the current or official exchange rate to translate the monetary units of this market into a single unit for the world economy since exchange rates typically do not closely reflect worldwide value, for example in cases where the volume or price of transactions is closely regulated by the government.

Rather, market valuations in a local currency are typically translated to a single monetary unit using the idea of purchasing power. This is the method used below, which is used for estimating worldwide economic activity in terms of real United States dollars or euros. However, the world economy can be evaluated and expressed in many more ways. It is unclear, for example, how many of the world's 7.62 billion people have most of their economic activity reflected in these valuations.
According to Maddison, until the middle of 19th century, global output was dominated by China and India. Waves of Industrial Revolution in Western Europe and Northern America shifted the shares to the Western Hemisphere. As of 2017, the following 15 countries or regions have reached an economy of at least US$2 trillion by GDP in nominal or PPP terms: Brazil, China, India, Germany, France, Indonesia, Italy, Japan, South Korea, Mexico, Russia, Turkey, the United Kingdom, the United States and the European Union.[3]
Overview
World economy by country groups
The following two tables list the country groups with individual countries designated by the IMF.[4] Members of the G-20 major economies are in bold.






List of country groups by GDP (nominal) in millions US$[5]List of country groups by GDP (PPP) in 2018 in millions US$[5]
Current world economic league table of largest economies in the world by GDP and share of global economic growth
The following two tables list the 25 largest economies by GDP (nominal), twenty largest economies by GDP (PPP). Members of the G-20 major economies are in bold.






List of the 25 largest economies
 by GDP (nominal) at their peak level of GDP in millions US$[6]List of the 25 largest economies
 by GDP (PPP) at their peak level of GDP in millions US$[7]
Twenty largest economies in the world by nominal GDP

The following is a list of the twenty largest economies by nominal GDP at peak value as of the specific year according to International Monetary Fund.[8]


Twenty largest economies in the world by GDP (PPP)
The following is a list of twenty largest economies by GDP based on purchasing power parity at peak value as of the specific year according to the International Monetary Fund and the CIA World Factbook.[9][10]

Statistical indicators
Economy
GDP (GWP) (gross world product): (purchasing power parity exchange rates) – $59.38 trillion (2005 est.), $51.48 trillion (2004), $23 trillion (2002)
GDP (GWP) (gross world product):[11] (market exchange rates) – $60.69 trillion (2008)
GDP[12] (real growth rate): 
Developed Economies  2.2% (2017), 2.0% (predicted 2018)
Developing Countries  4.3% (2017), 4.6% (predicted 2018)
Least developed countries 4.8% (2017), 5.4% (predicted 2018)
GDP – per capita: purchasing power parity – $9,300, €7,500 (2005 est.), $8,200, €6,800 (92) (2003), $7,900, €5,000 (2002)
World median income: purchasing power parity $1,041, €950 (1993)[13]
GDP – composition by sector: agriculture: 4%; industry: 32%; services: 64% (2004 est.)
Inflation rate (consumer prices); national inflation rates vary widely in individual cases, from declining prices in Japan to hyperinflation in several Third World countries (2003): 
World 2.6% (2017), 2.8% (predicted 2018);[14]
Developed Economies 1% to 4% typically
Developing Countries 5% to 60% typically
Least developed countries 11.4% (2017), 8.3% (predicted 2018)[14]
Derivatives OTC outstanding notional amount: $601 trillion (Dec 2010) ()
Derivatives exchange traded outstanding notional amount: $82 trillion (June 2011) ()
Global debt issuance: $5.187 trillion, €3 trillion (2004), $4.938 trillion, €3.98 trillion (2003), $3.938 trillion (2002) (Thomson Financial League Tables)
Global equity issuance: $505 billion, €450 billion (2004), $388 billion. €320 billion (2003), $319 billion, €250 trillion (2002) (Thomson Financial League Tables)
Employment



Unemployment rate: 8.7% (2009 est.). 30% (2007 est.) combined unemployment and underemployment in many non-industrialized countries; developed countries typically 4%–12% unemployment.
Industries
Industrial production growth rate: 3% (2002 est.)
Energy
Yearly electricity – production: 21,080,878 GWh (2011 est.),[15] 15,850,000 GWh (2003 est.), 14,850,000 GWh (2001 est.)
Yearly electricity – consumption: 14,280,000 GWh (2003 est.), 13,930,000 GWh (2001 est.)
Oil – production: 79,650,000bbl/d (12,663,000m3/d) (2003 est.), 75,460,000 barrels per day (11,997,000m3/d) (2001)
Oil – consumption: 80,100,000bbl/d (12,730,000m3/d) (2003 est.), 76,210,000 barrels per day (12,116,000m3/d) (2001)
Oil – proved reserves: 1.025 trillion barrel (163km³) (2001 est.)
Natural gas – production: 3,366km³ (2012 est.),[16] 2,569km³ (2001 est.)
Natural gas – consumption: 2,556km³ (2001 est.)
Natural gas – proved reserves: 161,200km³ (1 January 2002)
Cross-border
Yearly exports: $12.4 trillion, €11.05 trillion (2009 est.)
Exports – commodities: the whole range of industrial and agricultural goods and services
Exports – partners: US 12.7%, Germany 7.1%, China 6.2%, France 4.4%, Japan 4.2%, UK 4.1% (2008)
Yearly imports: $12.29 trillion, €10.95 trillion (2009 est.)
Imports – commodities: the whole range of industrial and agricultural goods and services
Imports – partners: China 10.3%, Germany 8.6%, US 8.1%, Japan 5% (2008)
Debt – external: $56.9 trillion, €40 trillion (31 December 2009 est.)
Gift economy
Yearly economic aid – recipient: net Official Development Assistance (ODA) of $135.2 billion (2014)[17]
Communications
Telephones – main lines in use: 843,923,500 (2007)
4,263,367,600 (2008)
Telephones – mobile cellular: 3,300,000,000 (Nov. 2007)[18]
Internet Service Providers (ISPs): 10,350 (2000 est.)
Internet users: 3,079,339,857 (December 31, 2014 ), 360,985,492 (December 31, 2000[19])
Transport
Transportation infrastructure worldwide includes:
Airports
Total: 41,821 (2013)[20]
Roadways (in kilometres)
Total: 32,345,165km
Paved: 19,403,061km
Unpaved: 12,942,104km (2002)
Railways
Total: 1,122,650km includes about 190,000 to 195,000km of electrified routes of which 147,760km are in Europe, 24,509km in the Far East, 11,050km in Africa, 4,223km in South America, and 4,160km in North America.
Military
World military expenditure in 2012: estimated to $1.756 trillion [21]
Military expenditures – percent of GDP: roughly 2% of gross world product (1999).
History

Economic studies
To promote exports, many government agencies publish on the web economic studies by sector and country. Among these agencies include the USCS (US DoC) and FAS (USDA) in the United States, EDC and AAFC in Canada, Ubifrance in France, UKTI in the UK, HKTDC and JETRO in Asia, Austrade and NZTE in Oceania. Through Partnership Agreements, the Federation of International Trade Associations  publishes studies from several of these agencies (USCS, FAS, AAFC, UKTI and HKTDC) as well as other non-governmental organizations on its website GlobalTrade.net.
See also
Capitalism
Common Wealth: Economics for a Crowded Planet (book)
Economic collapse
Economic history of the world
Emerging and growth-leading economies
Global financial system
Global workforce
Globality
Globalization
Trade route
Overconsumption
World Trade Report
World systems theory
Regional economies:
Economy of Africa
Economy of Asia
Economy of Europe
Economy of North America
Economy of Oceania
Economy of South America
Events:
2007–2008 world food price crisis
Late 2000s recession
Oil price increases since 2003
Lists:
List of countries by GDP sector composition
List of world's largest economies (nominal) – based on current currency market exchange rates
List of world's largest economies (PPP) – based on purchasing power parity
Historical list of world's largest economies (PPP) – for the years between 1 and 1998
List of world production