This PBL is great for a 3rd grade economics unit. It can be used in conjunction with a guided reading book about money. Students create a how-to guide on becoming a millionaire. They come up with ideas on how they can make money. For ex. Lemonade stand, gardening, etc. It can also be a mini persuasive unit because they need to describe how each idea will make them money and how much. A great unit for kids to show their creativity!