Journal of Commerce--DHL's Goldberg says operation costs rise even when shipping rates fall 

Ocean freight rate volatility is ratcheting up global supply chain costs even when rates head downward, said a DHL Global Forwarding executive.

The “roller coaster” of slot supply and demand on mainline routes in recent years had “caused havoc” to supply chains, said David Goldberg, DHL’s senior vice president for ocean freight in the North Asia Pacific. Continual boom-bust doesn’t benefit lines or the buyers of their services who would prefer stability to allow better planning. 
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