First, explain what substitutes and complements are: (a) in a technical way* and (b) to your friend the English major who has no economics background.
Then, read Bradford & Bradford (2016) and explain why the issue of complements vs. substitutes is essential to understanding the findings.
* No graph is needed
Responses should be 1-2 pages, neatly formatted with double spacing, 12 point font, and 1” margins.
Do not use outside sources, just write everything in your own language.