 In 2009, the National Retail Federation anticipated that American households would decrease Halloween spending by as much as 15% to $56.31.In 2013, Americans spent an estimated $6.9 billion to celebrate Halloween, including a predicted $2.6 billion on costumes (with more spent on adult costumes than for children's costumes) and $330 million on pet costumes.In 2017 it was estimated that Americans would spend $9.1 billion on Halloween merchandise with $3.4 billion of that being on spend on Halloween costumes.