Question: What is the name of the economist that worked alongside physicists Eugene Wigner and John Archibald Wheeler as part of the Princeton Three?

Context paragraphs:
Wheeler–Feynman absorber theory: The Wheeler–Feynman absorber theory (also called the Wheeler–Feynman time-symmetric theory), named after its originators, the physicists Richard Feynman and John Archibald Wheeler, is an interpretation of electrodynamics derived from the assumption that the solutions of the electromagnetic field equations must be invariant under time-reversal transformation, as are the field equations themselves.  Indeed, there is no apparent reason for the time-reversal symmetry breaking, which singles out a preferential time direction and thus makes a distinction between past and future.  A time-reversal invariant theory is more logical and elegant.  Another key principle, resulting from this interpretation and reminiscent of Mach's principle due to Tetrode, is that elementary particles are not self-interacting.  This immediately removes the problem of self-energies.

Wigner quasiprobability distribution: The Wigner quasiprobability distribution (also called the Wigner function or the Wigner–Ville distribution after Eugene Wigner and ) is a quasiprobability distribution.  It was introduced by Eugene Wigner in 1932 to study quantum corrections to classical statistical mechanics.  The goal was to link the wavefunction that appears in Schrödinger's equation to a probability distribution in phase space.

The Princeton Three: The Princeton Three was a group of two physicists and a political economist working at the Princeton University during the Cold War Era.  Of the three men Eugene Wigner and John Archibald Wheeler studied physics and Oskar Morgenstern studied political economy.  Their main goal was to establish a national science laboratory in the United States of America that would help America catch the Soviet Union in the Intermediate range ballistic missile (IRBM) race, as well as push the United States ahead in the space race.  The basic outline of this laboratory called for university scientists to have complete and open insight to the militaristic needs if the country in order to spend some two or three years working full-time, without the shackles of administrative bodies or security restrictions.  They would use their specific field of study to improve the defense systems of the military and other important project deemed necessary.

Gravitation (book): Gravitation is a physics book on Einstein's theory of gravity, written by Charles W. Misner, Kip S. Thorne, and John Archibald Wheeler and originally published by W. H. Freeman and Company in 1973.  Owing to its prominence, it is frequently abbreviated MTW after its authors' initials.  The book, which has more than 1200 pages, resembles a large telephone book in size and shape.  The cover illustration, drawn by Kenneth Gwin, is a line drawing of an apple with cuts in the skin to show geodesics.  It contains 10 parts and 44 chapters, each beginning with a quotation.  The bibliography has a long list of original sources and other notable books in the field.  The level of the book is advanced, with the intended audience at the graduate-level and above.

John Archibald Wheeler: John Archibald Wheeler (July 9, 1911 – April 13, 2008) was an American theoretical physicist.  He was largely responsible for reviving interest in general relativity in the United States after World War II.  Wheeler also worked with Niels Bohr in explaining the basic principles behind nuclear fission.  Together with Gregory Breit, Wheeler developed the concept of Breit–Wheeler process.  He is best known for linking the term "black hole" to objects with gravitational collapse already predicted early in the 20th century, for coining the terms "quantum foam", "neutron moderator", "wormhole" and "it from bit", and for hypothesizing the "one-electron universe".

Di-positronium: Di-positronium, or dipositronium, is a molecule consisting of two atoms of positronium.  It was predicted to exist in 1946 by John Archibald Wheeler, and subsequently studied theoretically, but was not observed until 2007 in an experiment performed by David Cassidy and Allen Mills at the University of California, Riverside.

Wigner–Eckart theorem: The Wigner–Eckart theorem is a theorem of representation theory and quantum mechanics.  It states that matrix elements of spherical tensor operators on the basis of angular momentum eigenstates can be expressed as the product of two factors, one of which is independent of angular momentum orientation, and the other a Clebsch–Gordan coefficient.  The name derives from physicists Eugene Wigner and Carl Eckart, who developed the formalism as a link between the symmetry transformation groups of space (applied to the Schrödinger equations) and the laws of conservation of energy, momentum, and angular momentum.

Wheeler's delayed choice experiment: Wheeler's delayed choice experiment is actually several thought experiments in quantum physics, proposed by John Archibald Wheeler, with the most prominent among them appearing in 1978 and 1984.  These experiments are attempts to decide whether light somehow "senses" the experimental apparatus in the double-slit experiment it will travel through and adjusts its behavior to fit by assuming the appropriate determinate state for it, or whether light remains in an indeterminate state, neither wave nor particle.

No-hair theorem: The no-hair theorem postulates that all black hole solutions of the Einstein-Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized by only three "externally" observable classical parameters: mass, electric charge, and angular momentum.  All other information (for which "hair" is a metaphor) about the matter which formed a black hole or is falling into it, "disappears" behind the black-hole event horizon and is therefore permanently inaccessible to external observers.  Physicist John Archibald Wheeler expressed this idea with the phrase "black holes have no hair" which was the origin of the name.  In a later interview, John Wheeler says that Jacob Bekenstein coined this phrase.

Ergosphere: The ergosphere is a region located outside a rotating black hole's outer event horizon.  Its name was proposed by Remo Ruffini and John Archibald Wheeler during the Les Houches lectures in 1971 and is derived from the Greek word "ergon", which means "work".  It received this name because it is theoretically possible to extract energy and mass from this region.  The ergosphere touches the event horizon at the poles of a rotating black hole and extends to a greater radius at the equator.  With a low spin of the central mass the shape of the ergosphere can be approximated by an oblated spheroid, while with higher spins it resembles a pumpkin-shape.  The equatorial (maximum) radius of an ergosphere corresponds to the Schwarzschild radius of a non-rotating black hole; the polar (minimum) radius can be as little as half the Schwarzschild radius (the radius of a non-rotating black hole) in the case that the black hole is rotating maximally (at higher rotation rates the black hole could not have formed).

Supporting paragraphs: The Princeton Three John Archibald Wheeler
Answer: Oskar Morgenstern