In the 1920's, a lot of advertisements and unnecessary things and items were purchased. $6 billion dollars! All of which was bought on credit. I have done some similar questions like these in the past, so I hope I'm right. But on Quizlet, I don't know if you have heard of it, but you can look up flashcards others made if you log into the site. It helped me through my Chinese courses 1 and 2 and I'm sure it can help you even more, being that most people are native English speakers. :)