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Item 0 !$ \int\limits_{- \pi}^{\pi} sen(x) dx = 2 \int\limits_{0}^{\pi} sen (x) dx !$
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The concept of fundamental or “intrinsic” value was also understood by players in the early stock market, although misleading prospectuses, the manipulation of share prices, and the stock market boom made its discovery an even more difficult task than usual. After the 1690s boom, Daniel Defoe (of Robinson Crusoé fame) stated that many stocks had been raised above their “intrinsic value” and that shares in the East India Company had sold at between 300 and 400 percent above their nominal value “without any material difference in intrinsic value”. The contemporary land-bank projectors, who wanted to replace a gold-backed currency with one supported by the value of land, even realized that the notion of “intrinsic value” was an oxymoron*, since “intrinsic” suggested and inward quality, while “value” was always external. For instance, Nicholas Barbon argued that “things have no value in themselves, it is opinion and fashion which brings them into use and gives them a value”. John Law, who was also a land-bank projector, went even further and claimed that price was simply the result of the interaction of supply and demand. Applied to the stock market, Law’s idea suggests that share prices are determined by liquidity (the supply of new funds to the market) rather than a reflection of inherent values.
* Note: Oxymoron (oximoro em português) “is a figure of speech in which opposite or contradictory ideas are combined (e.g. thunderous silence, sweet sorrow)”. Webster’s New Dictionary.
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Item 1 the author of “Crusoé” implied that East India Company share prices bore no relation to their intrinsic values.
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Item 2 Seja !$ f : [0,1] \rightarrow [0,1] !$ uma função crescente. Então se se definir a função g(x) = f(x) - x pode-se garantir que exista x* tal que g(x*) = 0 só se f for também contínua.
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É correta a afirmativa:
Item 4 Sejam X e Y variáveis aleatórias conjuntamente distribuídas segundo uma Normal bivariada. Suponha que !$ E(X) = \mu_X, E(Y) = \mu_Y !$, !$ Var(X) = \sigma_X^2 !$, !$ Var(Y) = \sigma_Y^2 !$ e que a correlação entre X e Y seja ρXY. Então, !$ E(Y|X) = \mu_Y + pXY ( x - \mu X) !$.
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A respeito dos determinantes do consumo, avalie a informação:
Item 2 De acordo com a hipótese da renda permanente, a propensão marginal a consumir a partir da renda transitória é maior que a propensão marginal a consumir a partir da renda permanente.
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Avalie a proposição abaixo:
Item 0 Entende-se por “superávit fiscal primário” a diferença entre receitas e gastos governamentais, excetuadas as despesas com pagamento de juros.
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É correta a afirmativa:
Item 2 Um estimador consistente pode não ser eficiente.
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Com base na teoria das preferências, avalie a afirmativa:
Item 3 Um indivíduo com preferências estritamente côncavas entre dois bens especializa-se no consumo de um dos bens.
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The land-bankers’ argument that value was an extrinsic quality – subject to changing “opinion and fashion” – was particularly relevant to the stock market, since from the launch of diving companies onwards the market had fallen for a succession of fads. The rise of the stock market in the early 1690s was accompanied by a fashion for increasingly extravagant ladies’ headdresses, which climbed in height from the early 1690s until they peaked at over seven feet in 1695 (the year the stock market crashed). This prompted Sir Richard Steel to remark that “Stocks have risen and fallen in proportion to headdresses” – an observation which anticipates the connection between women’s rising hemlines and the stock market in the 1920s (what has become the “hemline theory of stock prices”). In 1919 the average level of the hem above the ground was 10 percent of a woman’s height. In 1920, during the postwar recovery, the hemline rose to around 20 percent. In the recession of 1921, it fell back to around 10 percent. As the bull market took off in 1924, hemlines rose until they reached 25 percent, in 1927, at which point they met the knee. They remained there until late 1929. After the Great Crash, hemlines fell until with the onset of the Great Depression they brushed the ground.
According to the text, the “hemline theory of stock prices”
Item 3 has no historical precedent.
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"Mandate, regulate, litigate." That has been the green mantra. And it explains the world's top-down, command-and-control approach to environmental policymaking. Slowly, this is changing. Yesterday's failed hopes, today's heavy costs and tomorrow's demanding ambitions have been driving public policy quietly towards market-based approaches. One example lies in the assignment of property rights over "commons", such as fisheries, that are abused because they belong at once to everyone and no one. Where tradable fishing quotas have been issued, the result has been a drop in over-fishing. An emission trading is also taking off. America led the way with its sulphur-dioxide trading scheme, and today the EU is pioneering carbon-dioxide trading with the (albeit still controversial) goal of slowing down climate change.
According to the text,
According to the text,
Item 0 the so-called “green mantra” surmises their approach to environmental policy.
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