El Paso Independent School District in El Paso Texas created this Economics text for its high school course using OER, CC, and public domain content from a variety of sources by educators in the district. The course is aligned to the Texas TEKS and is usually taken in Grade 11.
The original book can be found at https://flexbooks.ck12.org/user:3d76c1256888/cbook/episd-2019-2020-economics-with-emphasis-on-the-free-enterprise-system/section/1.1/primary/lesson/unit-1-introduction-vocabulary-and-objectives/