The Economic History Association is like a club for people who like to study how money and business work throughout history. They are like detectives who try to figure out how people made money and spent it a long time ago. They look at old documents and letters to try and understand how things used to be in the olden days. They also try to see if there were any patterns or similarities between how people did things in the past and how we do things today. Think of it like a big puzzle where they try to put all the pieces together to understand how money has been used throughout history.