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The '''four-day workweek''' can be efficient for some manufacturing operations. For example, Kyanize paint company increased productivity from 15 batches a week to 16 batches a week, while actually saving money - and, by the way, increasing employee morale. Instead of making 3 batches of paint Monday through Friday (3 x 5 = 15), they made 4 batches of paint Monday through Thursday (4 x 4 = 16).
==Books==
*''Four Days, 40 Hours: Reporting a revolution in work and leisure'' by Riva Poor. Foreword by [[Paul A. Samuelson]] ISBN 0-330-23389-0