Thomas Sowell’s Basic Economics, now in it’s 5th edition, is one of my favorite economics texts for the lay reader.
This book gives you the equivalent of a college-level Economics 101 course. (And I should know: Economics was my undergraduate major.)
I will warn you: This book is long (about 700 pages) and parts of it are a little dry. But it is well worth the effort, if you want a basic understanding of how modern economies work.