The most reliable source for lecture slides is through the publisher or verified academic portals.
The slides are well-organized, clear, and concise, making it easy to follow along with the lectures. The diagrams and graphs are also well-designed, which helps to visualize the concepts and make them more tangible. I love that the PPT covers all the key topics, including national income, economic growth, inflation, unemployment, and more.
If you find a PDF or PPT on a file-sharing site (CourseHero, Scribd, Academia.edu), it is usually:
This chapter examines the role of financial markets in the economy, including: