June 8 2010 08:40 AM

The Cass Freight Index of U.S. shipping demand jumped 11.1 percent in May over the same month a year ago, the second straight double-digit increase for the closely watched measure.

The May shipments index released Tuesday also was 2.3 percent better than the April figure, the fourth straight month-over-month improvement and a sign that companies are maintaining efforts to push more goods to factories and stores this spring.

U.S. freight shippers increased their spending 24.7 percent in May over the same month a year ago and 5.6 percent from April, suggesting shipping costs were rising even faster than demand. 

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