system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why doesn't Trader Joes have sales?

They're the only grocery store I've ever seen that does not have sales.
gpt
You do sales for two primary reasons: get people into the store, or get rid of excess inventory.

Trader Joe's has a nearly cult-like following...they don't need sales to get people in the store (they barely advertise anyway so having a sale wouldn't help much). 

They also have only about 1/10th the number of unique items for a typical grocery store and have a much lower stock of perishable inventory. This combination means they're much less likely to be overstocked on anything, so they don't need sales to get rid of excess.