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the training cost of touch-typing, and the switching cost of retraining. There may also be a network effect of having a standard layout. For example, the ubiquity of the QWERTY layout has been used as a business case study in switching cost. Nevertheless, significant market forces can create change, such as in the Turkish adoption of QWERTY. Non-core keys are more prone to change, as they are less frequently used and less subject

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