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单词 dynamic equilibrium
释义
dynamic equilibrium

Physics
  • See equilibrium.


Mathematics
  • A body is in dynamic equilibrium if it is moving with constant velocity and the vector sum of the forces acting on it is zero.


Chemistry
  • See equilibrium.


Chemical Engineering
  • See equilibrium.


Geology and Earth Sciences
  • See equilibrium.


Geography
  • In a landform, a state of balance, in spite of changes taking place within it. For example, dynamic equilibrium in an alluvial stream would be ‘delicately adjusted to provide, with available discharge and with prevailing channel characteristics, just the velocity required for the transportation of the load supplied from the drainage basin’ (Biedenharn et al. (2000) Geomorph. 34, 3–4).


Economics
  • An equilibrium in an intertemporal setting, that is, when the economy has more than one time period. The characterization of the dynamic equilibrium depends on the set-up of a particular model. For example, in a competitive economy with an infinitely lived consumer characterized by a utility function and a time discount factor, a short-term (single-period) production technology, and a bounded sequence of initial endowments for each period, the Walrasian equilibrium is described by a bounded production path and a bounded price sequence such that the consumption path is feasible in every period and maximizes the discounted stream of utility subject to the single aggregate (over time) budget constraint, and the production path maximizes short-run profit. In this case the single budget constraint implies the assumption of complete markets, i.e. at time zero there is a forward market for every commodity for every day, or an asset (such as money) is available to transfer purchasing power over time. See also balanced growth path.


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