Example: Logitech Mouse
An example of the difference that broadening the user base can bring is seen in the field of computer input devices. One of the most recent areas of research into computer access has been the advent of so-called haptic interfaces, interfaces that the user can 'feel'.
The most popular use of the technology has been in the development of input devices offering force feedback, where the device moves under the computer's control, as well as that of the user. The addition of force feedback to input devices has proven very popular with the games market(e.g.for joysticks and steering wheels).
However, that same force feedback can be used to add 'gravity' to targets on the screen (e.g. icons or scroll bars), helping attract the cursor when it is near to them. This method of assistance is extremely useful for users with difficulty controlling the mouse, particularly for homing in on targets.
A number of companies specialising in input devices for users with motion impairments developed computer mice that incorporated the force feedback technology. The resultant products were marketed exclusively to those users with special needs and sell for approximately £1000 ($1500). However, Logitech, took exactly the same technology and marketed their Wingman Force Feedback mouse to both the mainstream games market and to the special needs market. As a result of the increased market size and consequent opportunity to benefit from economies of scale, the Logitech mouse sold for £60 ($100) in the UK. It offers exactly the same functionality as the more expensive, special purpose versions.
Unsurprisingly, the Logitech mouse is the most popular force feedback mouse with both the mainstream and special needs markets