Standard 8th-grade workbooks typically cover these fundamental areas. If you are stuck on a specific task, these definitions are standard across most "GDZ" resources:
Рабочие тетради Экономика 8 класс - Рослит gdz po ekonomike 8 klass rabochaia tetrad
The content of your workbook depends on the specific author assigned by your school. The most widely used versions include: the role of money
by N. V. Bolotnikova : Frequently used in general education for basic economic concepts. gdz po ekonomike 8 klass rabochaia tetrad
by Yu. N. Korlyugova : Often paired with textbooks by I.V. Lipsits. It covers market operations, the role of money, and the connection between ecology and economics.