Matrix Consistency is the property that makes it possible to have correct country-to-country quantity relationships for each detailed category and, at the same time, to obtain the correct country-to-country quantity relationships for any desired aggregation of categories simply by summing the quantities for the included categories. This requires that the quantities be stated in value terms so that (a) the values for any category are directly comparable between countries and (b) the values for any country are directly comparable between categories. (Source: OECD)
