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  2. Modal logic - Wikipedia

    en.wikipedia.org/wiki/Modal_logic

    The commonly employed system S5 simply makes all modal truths necessary. For example, if p is possible, then it is "necessary" that p is possible. Also, if p is necessary, then it is necessary that p is necessary. Other systems of modal logic have been formulated, in part because S5 does not describe every kind of modality of interest.

  3. The Elephant Curve - Wikipedia

    en.wikipedia.org/wiki/The_Elephant_Curve

    The Elephant Curve, also known as the Lakner-Milanovic graph or the global growth incidence curve, is a graph that illustrates the unequal distribution of income growth for individuals belonging to different income groups. [1] The original graph was published in 2013 and illustrates the change in income growth that occurred from 1988 to 2008 ...

  4. Lorenz curve - Wikipedia

    en.wikipedia.org/wiki/Lorenz_curve

    The curve is a graph showing the proportion of overall income or wealth assumed by the bottom x% of the people, although this is not rigorously true for a finite population (see below). It is often used to represent income distribution , where it shows for the bottom x % of households, what percentage ( y %) of the total income they have.

  5. Income distribution - Wikipedia

    en.wikipedia.org/wiki/Income_distribution

    In economics, income distribution covers how a country's total GDP is distributed amongst its population. [1] Economic theory and economic policy have long seen income and its distribution as a central concern. Unequal distribution of income causes economic inequality which is a concern in almost all countries around the world. [2] [3]

  6. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    For example, in the conditional statement: "If P then Q", Q is necessary for P, because the truth of Q is guaranteed by the truth of P. (Equivalently, it is impossible to have P without Q , or the falsity of Q ensures the falsity of P .) [ 1 ] Similarly, P is sufficient for Q , because P being true always implies that Q is true, but P not being ...

  7. Income inequality metrics - Wikipedia

    en.wikipedia.org/wiki/Income_inequality_metrics

    Income distribution has always been a central concern of economic theory and economic policy. Classical economists such as Adam Smith, Thomas Malthus and David Ricardo were mainly concerned with factor income distribution, that is, the distribution of income between the main factors of production, land, labour and capital.

  8. Contingency (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Contingency_(philosophy)

    Contingency is one of three basic modes alongside necessity and possibility. In modal logic, a contingent statement stands in the modal realm between what is necessary and what is impossible, never crossing into the territory of either status. Contingent and necessary statements form the complete set of possible statements.

  9. Edgeworth box - Wikipedia

    en.wikipedia.org/wiki/Edgeworth_box

    Indeed, so long as the government recognises a desirable distribution of income it does not need to have any idea of the optimal allocation of resources. In a statement for a more general economy, the theorem would be taken as saying that α' can be reached by a monetary transfer followed by the free play of market exchange; but money is absent ...