externality
91Spam (electronic) — An email box folder littered with spam messages A typical spam m …
92Tax — Taxation An aspect of fiscal policy …
93Tragedy of the commons — Cows on Selsley Common. The tragedy of the commons is one way of accounting for overexploitation. The tragedy of the commons is a dilemma arising from the situation in which multiple individuals, acting independently and rationally consulting… …
94Unemployment — World unemployment rates[1] as of January 2009[update] Unemployment (or …
95Greenhouse gas — Simple diagram of greenhouse effect. A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] …
96Airport — For other uses, see Airport (disambiguation). Pulkovo Airport in Saint Petersburg, Russia (2005) …
97Invention — An invention is a new form, composition of matter, device, or process. Some inventions are based on pre existing forms, compositions, processes or ideas. Other inventions are radical breakthroughs which may extend the boundaries of human… …
98Utility — This article is about the economic concept. For other uses, see Utility (disambiguation). Part of a series on Utilitarianism …
99Opportunity cost — Economics …
100Deadweight loss — created by a binding price ceiling. Producer surplus is necessarily decreased, while consumer surplus may or may not increase; however the decrease in producer surplus must be greater than the increase (if any) in consumer surplus. In economics,… …
