Nearly 78 percent of all discretionary income is held by households earning more than $100,000. Average discretionary income for this segment, $66,451, is 2.7 times the national average.

Seventy three million U.S. households now have discretionary income, up from about 57 million in 2002. The percent of the U.S. population with discretionary income has increased to nearly 64 percent, up from 52 percent in 2002 according to data released by the Conference Board.

Total discretionary income in the U.S. topped $1.7 trillion in 2006, with the household average at $24,335. Per capita income stood at $9,148.

Nearly 78 percent of all discretionary income is held by households earning more than $100,000. Average discretionary income for this segment, $66,451, is 2.7 times the national average.

Households with discretionary income, as defined by the study, are those whose spendable income exceeds that held by households with similar demographic features.

"While the percentage of households with discretionary income has risen over the past several years, purchasing power remains concentrated in the wallets of the affluent," says Lynn Franco, Director of The Conference Board Consumer Research Center. "More than three out of every four discretionary dollars flows to householders earning $100,000 or more. And their average discretionary income is more than 2.5 times above average. "

Top Regions for Discretionary Income
The region with the wealthiest concentration of households is New England (including Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island and Vermont). About 63 percent of households have discretionary income, with an average amount of $27,337.

Household discretionary income is lowest in the West North Central region (including Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota and South Dakota). Average household discretionary income in this region is $20,749.

Top States for Discretionary Income
California, the most populous state, is also the state with the largest number of households with discretionary income - 8 million. These households hold $224.7 billion in total discretionary income.

Texas has the second highest number of households with discretionary income -- more than 5 million, with $136.8 billion in total discretionary income. Other top states include Florida, with almost 4.7 million households holding $126.1 billion, and New York, with about 4.6 million households holding $119.4 billion in discretionary income.

More data from discretionary income study;
- The top end of the affluent group (households with earnings of $200,000 and over) accounts for only 3 percent of total households and 5 percent of households with discretionary income. This group, however, has 38 percent of total discretionary income with an average of $173,613, more than seven times the national average.

- Households with earnings of less than $50,000 represent nearly 60 percent of all households and 29 percent of households with discretionary income. However, they account for only 3 percent of aggregate discretionary income. Average discretionary income among this market is about $1,900.

- In terms of generations, baby boomers (born between 1946-1964) represent the largest group, with 43.7 million households. More than two-thirds have discretionary income. This segment has the highest average discretionary income, at $29,754. Generation X (born between 1965-1981) is the second largest group, with 34 million households. Slightly less than two-thirds have discretionary income. This segment has the second highest average discretionary income, at $22,562.

- Householders in management, business and financial occupations tend to have the most discretionary income. Almost 87 percent of households in this group have discretionary income. The average amount is $41,922.