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  2. Income inequality metrics - Wikipedia

    en.wikipedia.org/wiki/Income_inequality_metrics

    Consider life cycle effects. In most Western societies, an individual tends to start life with little or no income, gradually increase income till about age 50, after which incomes will decline, eventually becoming negative. This affects the conclusions which can be drawn from a measured inequality.

  3. Ragnar Nurkse's balanced growth theory - Wikipedia

    en.wikipedia.org/wiki/Ragnar_Nurkse's_balanced...

    Cyclical downswing is a feature of an advanced stage of sustained growth rather than of the vicious cycle of poverty. Hirschman also stated that during conditions of slack activity in developed countries, the stock of resources, machines and entrepreneurs are merely unemployed, and are present as idle capacity.

  4. Miller index - Wikipedia

    en.wikipedia.org/wiki/Miller_index

    With hexagonal and rhombohedral lattice systems, it is possible to use the Bravais–Miller system, which uses four indices (h k i â„“) that obey the constraint h + k + i = 0. Here h , k and â„“ are identical to the corresponding Miller indices, and i is a redundant index.

  5. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    The diamond crystal structure belongs to the face-centered cubic lattice, with a repeated two-atom pattern.. In crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point).

  6. Crystal structure - Wikipedia

    en.wikipedia.org/wiki/Crystal_structure

    By definition, the syntax (hkâ„“) denotes a plane that intercepts the three points a 1 /h, a 2 /k, and a 3 /â„“, or some multiple thereof. That is, the Miller indices are proportional to the inverses of the intercepts of the plane with the unit cell (in the basis of the lattice vectors).

  7. Overlapping generations model - Wikipedia

    en.wikipedia.org/wiki/Overlapping_generations_model

    The overlapping generations (OLG) model is one of the dominating frameworks of analysis in the study of macroeconomic dynamics and economic growth.In contrast to the Ramsey–Cass–Koopmans neoclassical growth model in which individuals are infinitely-lived, in the OLG model individuals live a finite length of time, long enough to overlap with at least one period of another agent's life.

  8. Malthusianism - Wikipedia

    en.wikipedia.org/wiki/Malthusianism

    Thomas Robert Malthus, after whom Malthusianism is named. Malthusianism is a theory that population growth is potentially exponential, according to the Malthusian growth model, while the growth of the food supply or other resources is linear, which eventually reduces living standards to the point of triggering a population decline.

  9. Engel's law - Wikipedia

    en.wikipedia.org/wiki/Engel's_law

    The Engel coefficient is used for this purpose by The United Nations (UN), where a coefficient above 59% represents poverty, 50-59% represents a state where daily needs are barely met, 40-50% a moderately well-off standard of living, 30-40% a good standard of living and below 30% a wealthy life. [16] Inferring well-being from budget share for food.