Americans will spend a whopping $7.4 billion on Halloween products in 2014, according to the National Retail Federation. $2.8 billion will be spent on costumes, of which the animal, Batman character and witch are going to be the most popular. Americans are also planning on splashing out a whopping $350 million on costumes for their pets. Most pets you see walking the streets on Halloween night will be dressed as pumpkins, hot dogs and devils!78 percent of people in the United States plan on dressing up this year, with 20 percent making costumes by themselves. In 2013, 158 million people celebrated Halloween in the US and this will rise to 162 million in 2014. Average expenditure will come to $87 for young adults compared to $77.52 in total. Nearly 47 percent are going to decorate their home or yard while 33.4 percent will throw or attend a party. 77.1 percent of Americans plan to hand out candy to trick or treaters.