 There are only three countries in the world that don't officially use the metric system, the United States, Liberia, and Myanmar. Every time the metric system has been proposed in the US, American industrialists argued that retooling was prohibitively expensive. Big businesses' self-interest might actually be self-defeating. Using different measurements than all the world's other major economies certainly adds confusions with imports and exports. Businesses who want to be involved in the global marketplace already use the metric system a metric ton, and we're already using the metric system in many parts of our lives. America already sells our soda and liters and our nutrition labels measure in grams. Wine and distilled spirits have been successfully sold with only metric measures since the early 1980s, so we are kind of on the metric system just with some extra math involved.