The main reading is a set of lecture notes that will be provided on Canvas at the start of the semester.
It is not necessary to buy a textbook, but you may find it useful to get an alternative exposition of the material, additional problems, etc.
Textbook:
Nick Huntington-Klein, The Effect: An Introduction to Research Design and Causality, Chapman & Hall/CRC, 1st ed. 2021; 2nd ed. 2025.
Freely available as an HTML textbook here: https://theeffectbook.nethttps://theeffectbook.net
Alternative textbook:
Wooldridge, J.: Introductory Econometrics, 7th edition (slightly more technical than Stock and Watson but overall similar)
If time: one or two academic articles on business topics.