This is an excellent article written by a man who grew up in a country controlled by a communist economy. He explains the differences between a communist economy (what the textbook calls a "command economy") and a free market economy. You should read this article to understand why a free market economy works best (no matter what nonsense the textbook claims).
https://fee.org/articles/communist-economics-in-one-page-a-refresher-course/?utm_medium=popular_widget
https://fee.org/articles/communist-economics-in-one-page-a-refresher-course/?utm_medium=popular_widget