From a 1956 issue of the then-newly rebrand­ed Friends Jour­nal, an expla­na­tion of the ethics behind pro­vid­ing a fixed price for goods:

Whether the ear­ly Quak­ers were con­scious­ly try­ing to start a social move­ment or not is a moot point. Most like­ly they were not. They were mere­ly seek­ing to give con­sis­tent expres­sion to their belief in the equal­i­ty of all men as spir­i­tu­al sons of God. The Quak­er cus­tom of mark­ing a fixed price on mer­chan­dise so that all men would pay the same price is anoth­er case in point. Most prob­a­bly Friends did this sim­ply because they want­ed to be fair to all who fre­quent­ed their shops and give the sharp bar­gain­er no advan­tage at the expense of his less skilled broth­er. It is unlike­ly that many Quak­ers adopt­ed fixed prices in the hope of forc­ing their sys­tem on a busi­ness world inter­est­ed only in prof­it. That part was just coin­ci­dence, the coin­ci­dence being that Friends hit upon it because of their con­vic­tions; the sys­tem itself was a nat­ur­al success.
 — Bruce L Pear­son, Feb 4 1956