Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Alternative spelling of Pareto efficient.
Etymologies
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Examples

In other words, classic Jeremy Bentham utilitarianism versus Paretoefficient Kantian deontology?
Who Loses From Efficiency?, Bryan Caplan  EconLog  Library of Economics and Liberty

For instance, Pazner and Schmeidler (1974) found out that there may not exist envyfree and Paretoefficient allocations in the context of production with unequal skills (when there are highskilled individuals who are strongly averse to labor).

It has been shown by Varian (1976) that, if preferences are sufficiently diverse and numerous (a continuum), then the competitive equilibrium with equal shares is the only Paretoefficient and envyfree allocation.

If one also requires the selection to be Paretoefficient, then one obtains a characterization of the competitive equilibrium with equal shares (Gevers 1986).

It is Paretoefficient because, by an important theorem of welfare economics, any perfectly competitive equilibrium is Paretoefficient (in absence of asymmetric information, externalities, public goods).

A competitive equilibrium with equal shares (i.e., equal budgets) is the central example of a Paretoefficient and envyfree allocation.

Stiglitz J.E. 1987, “The theory of Paretoefficient and optimal redistributive taxation”, in Auerbach, Feldstein (eds.).

Instead, the claim of rational choice contractarianism is that the correct account of binding moral norms is one that implies that if these norms are followed, the outcomes will be Paretoefficient.

Whereas contractarian choice would have it that (Stag, Stag) is the correct norm to settle upon, evolutionary game theory teaches us that it is unlikely that the Paretoefficient equilibrium will be selected in a process of repeated interactions.

What is more, the Paretoefficient equilibrium is unstable: occasional deviations from this equilibrium will lead the population as a whole to coordinate on (hare, hare) rather than (stag, stag).
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