The advantage of constructing estimates on the marine economy within the framework used for BEA’s GDP accounts is that the overall marine economy can be compared to GDP for the nation. This includes marine economy activity as a percentage of GDP as well as whether GDP for the marine economy is growing faster or slower than the overall U.S. economy. For the marine economy statistics, BEA provides measures of “value added” for each industry that makes up the marine economy, for groups of marine economy goods and service types, and for the marine economy overall. Value added refers to the contribution of labor and capital by each industry to the nation’s GDP. It is the value that an industry generates after accounting for the cost of energy, materials, and services used up in production.