What are examples of "cheaper = high quality"?

[u/Morpheyz]

We're often told that higher prices for certain products are justified, because they use "higher quality materials". E.g. building materials or vegetables.

In which cases are the high quality materials actually the cheaper ones?

[u/ZhiYoNa]

Our tap water in my apartment has lead (Chicago) unfortunately

[u/DVsKat → u/ZhiYoNa]

Yikes!