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Feasibility of Touch Screen Apple Notebooks
According to the analysts, adding a multi-touch screen onto a MacBook Pro would add 50-80% to the cost of the existing screen and would likely make it too expensive. However, introducing a multi-touch screen into a 9 inch screen would be a "relatively easy leap from a cost perspective".
Given this, the author speculates that a small (9" or so) inexpensive (sub $800) multi-touch notebook is a more likely possibility than a full-size multi-touch notebook.