Some interesting data from the BLS looking at differences and similarities in how different income brackets spend their money. Not surprisingly, the wealthier spend more in absolute terms, but generally less in percentage of income terms — except when it comes to savings as a "spend," where increased affluence allows for increased reserves for the future.
Where the poor and rich really spend their money
Lawmakers in several states are urging limits on what you can buy with food stamps, but when it comes to grocery shopping, rich and poor actually make very similar decisions.