Recovering from holidays can be a long process, especially the big ones. Thanksgiving leaves you with leftovers for days, dirty dishes and pans to wash. Christmas can require a week to un-decorate, return presents, clean up wrapping paper and pine needles. But another holiday is getting bigger and bigger each year. According to a recent Fast Company article, Halloween is a multi-billion dollar holiday. In 2011, $2.3 billion was spent in the US on candy alone. What started as harvest festivals with religious and spiritual meanings has turned into big business. As trick-or-treating became popular, candy companies ramped up production and marketing during the fall season, making this their 'Black Friday.' Candy poisoning scares in the 70s and 80s pushed more people to get the store bought variety and helped sales continue to grow. (Which, according to this Gizmodo article, was probably all for nothing anyways.) So, today as you clean up the rotting pumpkins, candy wrappers and fake spider webs around your 'haunted house,' remember the true meaning for the season; Money.