The world economy, or global economy, generally refers to the economy, which is based on economies of all of the world's countries, national economies. Also global economy can be seen as the economy of global society and national economies – as economies of local societies, making the global one. It can be evaluated in various kind of ways. For instance, depending on the model used, the valuation that is arrived at can be represented in a certain currency, such as 2006 US dollars or 2005 euros.

It is inseparable from the geography and ecology of Earth, and is therefore somewhat of a misnomer, since, while definitions and representations of the "world economy" vary widely, they must at a minimum exclude any consideration of resources or value based outside of the Earth. For example, while attempts could be made to calculate the value of currently unexploited mining opportunities in unclaimed territory in Antarctica, the same opportunities on Mars would not be considered a part of the world economy—even if currently exploited in some way—and could be considered of latent value only in the same way as uncreated intellectual property, such as a previously unconceived invention.

James Beeland Rogers, Jr. (born October 19, 1942) is an American investor and author. He is currently based in Singapore. Rogers is the Chairman of Rogers Holdings and Beeland Interests, Inc. He was the co-founder of the Quantum Fund with George Soros and creator of the Rogers International Commodities Index (RICI).

Rogers is an outspoken proponent of the free market, but he does not consider himself a member of any school of thought. Rogers acknowledged, however, that his views best fit the label of Austrian School of economics.

Rogers was born in Baltimore, Maryland and raised in Demopolis, Alabama. He started in business at the age of five by selling peanuts and by picking up empty bottles that fans left behind at baseball games. He got his first job on Wall Street, at Dominick & Dominick, after graduating with a bachelor's degree in History from Yale University in 1964. Rogers then acquired a second BA degree in Philosophy, Politics and Economics from Balliol College, Oxford University in 1966.

Dominic "Dom" Barton (born 1962) is a longtime top senior partner and director at management consultancy McKinsey & Company, serving as its current managing director (chief executive) since 2009. He graduated from the University of British Columbia and pursued an MPhil in Economics as a Rhodes Scholar at Brasenose College, Oxford University.

Barton was one of six students from a high school class of 200 to attend college.^{[citation needed]} After the studying at the University of British Columbia he won a Rhodes Scholarship to attend Oxford University. He began his career as a currency analyst at Rothschild.

He joined McKinsey's Toronto office in 1986 and had a difficult time making partner, saying "It took me three times before I was elected a partner....I was working hard and I was rejected….it was a bit of a slap in the head." From then on, he said, "my bar will be higher than McKinsey's."

In the late 90s he made the then-counterintuitive career move of relocating to Korea to develop McKinsey's practice in the region. Barton enjoyed close relationships with the president and government of South Korea. He subsequently parlayed those relationships into a role running McKinsey in Korea from 2000–2004 and then McKinsey in Asia from 2004-2009. Barton's experience in Asia ultimately made him a strong candidate in the firm election as global managing director.

Marc Faber, born February 28, 1946, is a Swiss investor.

Faber was born in Zürich and schooled in Geneva, Switzerland, where he raced for the Swiss National Ski Team. He studied Economics at the University of Zurich and, at the age of 24, obtained a Ph.D. degree in Economics magna cum laude. Faber is best known for the Gloom Boom & Doom Report newsletter and its related web site featuring "Dance of Death" paintings created by Kaspar Meglinger.

During the 1970s Faber worked for White Weld & Company Limited in New York City, Zürich, and Hong Kong. He moved to Hong Kong in 1973. He was a managing director at Drexel Burnham Lambert Ltd Hong Kong from the beginning of 1978 until the firm's collapse in 1990. In 1990, he set up his own business, Marc Faber Limited. Faber now resides in Chiangmai, Thailand, though he keeps a small office in Hong Kong.

Faber has a reputation for being a contrarian investor and has been called "Doctor Doom" for a number of years. He was the subject of a book written by Nury Vittachi in 1998 entitled Doctor Doom - Riding the Millennial Storm - Marc Faber's Path to Profit in the Financial Crisis. Faber has become a frequent speaker in various forums and makes numerous appearances on television around the world including various CNBC and Bloomberg outlets, as well as on internet venues like Jim Puplava's internet radio show. Dr. Faber's also engaged the Barron's Roundtable and the Manhattan Mises Circle, lecturing on "Mirror, Mirror on the Wall, When is the Next AIG to Fall?" Faber is said to be 8'0" tall