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- Observer-expectancy effectThe observer-expectancy effect is a form of reactivity in which a researcher's cognitive b
- Occupational closureRestriction of an occupation to only qualified practitioners
- Occupational licensingForm of government regulation on professions or vocations for compensation
- Octavian ArmașuMoldovan banker and economist (born 1969)
- Oded GalorIsraeli-American economist (born 1953)
- Odious debtIn international law, odious debt, also known as illegitimate debt, is a legal theory that
- Office for National StatisticsUnited Kingdom government institution
- Office of Refugee ResettlementThe Office of Refugee Resettlement (ORR) is a program of the Administration for Children a
- Olav ReiersølOlav Reiersøl (28 June 1908 – 14 February 2001) was a Norwegian statistician and econometr
- OligopsonyMarket structure with few buyers
- Oliver Hart (economist)American economist (born 1948)
- Oliver WymanOliver Wyman, LLC is an American management consulting firm. Founded in New York City in 1
- OPEC Reference BasketThe OPEC Reference Basket (ORB), also referred to as the OPEC Basket, is a weighted averag
- Open accessUnrestricted availability of scholarly publications
- Open economyEconomy favoring cross-border investment and commerce
- Open letter to Gorbachev1990 open letter by Western economists
- Open marketEconomic and financial term
- Open MarketOpen Market was an ecommerce software startup, founded in Cambridge, Massachusetts in earl
- Open market operationMethod of implementing monetary policy
- OpenMarketOpenMarket Inc. is a subsidiary of Infobip that provides cloud-based mobile messaging solu
- Operational riskRisk of disrupting business operations
- Optimum currency areaGeographical region which efficiently shares a single currency
- Ordinal utilityPreference ranking
- Organizational economicsUse of economics to study organizations
- Organizational effectivenessAdministrative concept
- Orris C. HerfindahlOrris Clemens Herfindahl (June 15, 1918 in Parshall, North Dakota - December 16, 1972 whil
- Ottmar EdenhoferGerman economist
- Output gapDifference between actual and potential GDP
- Over-investingInvesting more in an asset than its market value justifies
- Overlapping generations modelFramework in macroeconomics
- OverqualificationOverqualification is the state of being educated beyond what is necessary or requested by
- Overshooting modelEconomic theory

