sentences:  One use of national accounts is for classifying factor incomes and measuring their respective shares, as in .But, where focus is on income of "persons" or "households", adjustments to the national accounts or other data sources are frequently used.Here, interest is often on the fraction of income going to the top (or bottom) "x" percent of households, the next "x" percent, and so forth (defined by equally spaced cut points, say quintiles), and on the factors that might affect them (globalization, tax policy, technology, etc.