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Suppose in the graph to the right DF1 is the demand (MRP) curve for computer graphics designers for a website production firm. Suppose the firm switched from Windows computers to Macintoshes making the workers more productive. This would actually cause an increase in demand for graphics designers at the firm.
Any factor which makes an input more productive will lead to an increase it its demand by a profit maximzing firm (this always seems surprising at first). This is because increased productivity reduces MRP making the input more cost effective.
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