The reason this measurement is vital to tracking the growth of the U.S. economy is self-explanatory. When the economy is growing, both total income and total output are increasing. Furthermore, a steady increase in the GDP is healthy for the economy. According to the U.S. Department of Commerce, U.S. economic output has grown at an annual rate of 2.5 to 3.5 percent since 1890. The preliminary estimate of GDP in the fourth quarter of 1999 rose at a 6.9 percent annual rate, which is the strongest gain since a similar increase in mid-1996. This is an increase from the initial estimate of 5.8 percent and is consistent with the expectations of analysts. It is also a reflection of the widespread upward increases among the major spending components, including consumer spending, goods exported, and state and local government spending. In the third quarter of 1999, GDP rose 5.7% as a result of increases in Personal Consumption Expenditures, nonresidential fixed investment, and exports.
             Personal Income is a measurement of total pretax income earned by individuals, non-profit organizations, and private trust funds. It is expressed at an annual rate also. The more Personal Income increases the greater the potential for the American people to spend and save money, which directly influences the growth of the U.S. economy. Personal Income rose .7 percent in January, following an increase of .3 percent in December. The average monthly increases in 1999 were .5 percent. Some extenuating factors affected income in recent months, including cost of living increases in federal transfer payments, a federal pay raise, and agricultural subsidy payments in January. Real disposable income, income after taxes and adjusted for price changes, increased by .7 percent. There was no change in December. The individual personal saving rate rose from 1 percent in December, which was its low, to 1.4 percent in January. Savings rates generally go down ...