# Utility Functions

 abramdemski v1.9.0Sep 22nd 2020 (+276) Ruby v1.8.0Sep 15th 2020 (+143/-150) Multicore v1.7.0Sep 13th 2020 Multicore v1.6.0Sep 13th 2020 (+765) brook v1.5.0Aug 28th 2020 (+22) brook v1.4.0Aug 11th 2020 (+71/-12) jimrandomh v1.3.0Apr 29th 2020 Ruby v1.2.0Apr 16th 2020 Ruby v1.1.0Apr 16th 2020 (-950)

The VNM Theorem tag is likely to be a strict subtag of the Utility Functions tag, because the VNM theorem establishes when preferences can be represented by a utility function, but a post discussing utility functions may or may not discuss the VNM theorem/axioms.

Utility Functions do not work very well in practice for individual humans. Human drives are not coherent nor is there any reason to think they would be (Thou Art Godshatter), and even people with a strong interest in the concept have trouble working out what their utility function actually is even slightly (Post Your Utility Function). Furthermore, humans appear to calculate utility and disutility separately - adding one to the other does not predict their behaviourbehavior accurately. This makes humans highly exploitable.

See also: Complexity of Value, Decision Theory, Game Theory, Orthogonality Thesis, Utilitarianism, Preference, Expected utility, Utility

These do not work very well in practice for individual humans. Human drives are not coherent nor is there any reason to think they would be (Thou Art Godshatter), and even people with a strong interest in the concept have trouble working out what their utility function actually is even slightly (Post Your Utility Function). Furthermore, humans appear to calculate utility and disutility separately - adding one to the other does not predict their behaviour accurately. This makes humans highly exploitable.

pjeby posits humans' difficulty in understanding their own utility functions as the root of akrasia.

However, utility functions can be a useful model for dealing with humans in groups, e.g. in economics.

See also: Complexity of Value, Decision Theory, Game Theory, Orthogonality Thesis, Utilitarianism, Preference, Expected utility, Utility

A utility function assigns numerical values ("utilities"("utilities") to outcomes, in such a way that outcomes with higher utilities are always preferred to outcomes with lower utilities.