Spending by affluent Americans on holiday gifts is set to grow 4 percent to $23 billion with retail and restaurant gift cards, tickets to an event or a book topping the wish list, a study found Thursday.

But the survey of households with a discretionary income of more than $100,000 also found nearly 40 percent saying retail service has worsened and 20 percent saying product and service quality has deteriorated.

The boost in holiday gift spending comes from a rise in the number of affluent U.S. families, not an increase in household holiday budgets, which are due to remain flat at about $2,100, the American Express Publishing and Harrison Group poll found.

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