X-Nico

2 unusual facts about reciprocity


Axel Ockenfels

Engineering Trust - Reciprocity in the Production of Reputation Information. In: Management Science, Volume 59: 265-285 (with Gary E. Bolton und Ben Greiner).

Robert Cialdini

# Reciprocity – People tend to return a favor, thus the pervasiveness of free samples in marketing.


Calcutta Mathematical Society

The Society has a reciprocity relationship with American Mathematical Society and Cambridge Philosophical Society, whereby a member of one of the societies can become a member of the other by paying just half the subscription.

Canadian–American Reciprocity Treaty

In 1911 the Liberal government of Sir Wilfrid Laurier succeeded in signing a reciprocity treaty with American president William Howard Taft.

Concealed carry in the United States

Although carry may be legal under State law in accordance with reciprocity agreements, the Federal Gun Free School Zones Act subjects an out-of-state permit holder to federal felony prosecution if they carry a firearm within 1000 feet of any K-12 school's property line.

Helmholtz reciprocity

Rayleigh stated the basic idea of reciprocity as a consequence of the linearity of propagation of small vibrations, light consisting of sinusoidal vibrations in a linear medium.

International legal theories

This mode of enforcement contrasts with the traditional 'horizontal' mode involving State responsibility, reciprocity, and countermeasures.

John Thibaut

The early variations of Social Exchange Theory stem from Alvin Ward Gouldner's (1960) norm of reciprocity, which simply argues that people ought to return benefits given to them in a relationship.

Point spread function

It can be shown (see Fourier optics, Huygens-Fresnel principle, Fraunhofer diffraction) that the field radiated by a planar object (or, by reciprocity, the field converging onto a planar image) is related to its corresponding source (or image) plane distribution via a Fourier transform (FT) relation.

Quadratic reciprocity

Kenneth Ireland and Michael Rosen's A Classical Introduction to Modern Number Theory also has many proofs of quadratic reciprocity (and many exercises), and covers the cubic and biquadratic cases as well.

Strong reciprocity

The first model of strong reciprocity was proposed by Herbert Gintis in 2000, which contained a number of simplifying assumptions addressed in later models.


see also