"Making deals in pounds isn't easy when you're negotiating with someone who speaks in grams" is why many American firms are:

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To spur U.S. industry into action, the Department of Commerce indicated that accepting the metric system will not be mandatory unless you want to sell something to the U.S. government; all U.S. government purchases are to be conducted exclusively in metric. All federal buildings are now being designed with metric specifications, and highway construction funded by Washington uses metric units. Because the U.S. government is the nation's largest customer, this directive may be successful in converting U.S. business to the metric system.

"Making Deals in Pounds Isn't Easy When You're Negotiating with Someone