In many manufacturing systems, parts must be fed to automatic machines in a specific orientation. This is often accomplished by what are known as part-orienting systems (POSs). A POS consists of one or more separate devices that orient parts, usually with multiple orientations. A theoretical...

Previous studies of the effect of the 1978 Airline Deregulation Act on employee earnings have reported mixed results: some have found no negative long-run effect of deregulation and others have found a negative effect of up to 10%. Most of these studies relied on cross-sectional analysis of a...