Qwerty

[…] The Dvorak typewriter keyboard is, it has been claimed, ergonomically superior to the standard "Qwerty" arrangement. But having settled on the current standard keyboard, largely by historical accident, now manufacturers are supposedly reluctant to produce Dvorak keybboards so long as almost all typists are trained on Qwerty, while typists don't want to train on Dvorak when almost all keyboards are Qwerty. Even the inferior keyboard as a matched choice is superior to failing to coordinate at all.