While Frank Sinatra may have crooned about having a "merry little Christmas," retailers estimate many consumers may be planning a merry large Christmas with respect to holiday shopping. The National Retail Federation forecasts holiday spending will see a 4.1 percent bump this year to a total of $586.1 billion. That's an average of $749.51 per holiday shopper. Meanwhile, a recent analysis from TransUnion finds credit card debt and delinquencies are on the rise. Although the increase correlates with a pattern from 2011 in which credit card debt increased and then decreased, should the upward trend continue, it may indicate trouble for those planning to use plastic to fund this year's festivities.