The article says the port charges $300 to unload a container, and can unload 30 per hour from a ship. That's $9000/hour. The cost of labor in the operation is t

The article says the port charges $300 to unload a container, and can unload 30 per hour from a ship. That's $9000/hour. The cost of labor in the operation is trivial. The author's calculations of efficiency (units transferred per dock) appear incorrect to me since he failed to account for how often the dock is empty. The interesting questions to me are (1) are the docks in use full time? If so, automation might improve the ports volume. (2) If automated, would the reduced expenditures on cranes be sufficient to offset the cost of automation?