system
Given the following post, respond as if you're commenting on Reddit:
human
Why does a half dozen eggs cost almost as much as a dozen?
gpt
Two potential reasons, which may be interlinked. 

1. The marginal cost to extra eggs is very low therefore moving from 6 to 12 eggs costs little in terms of extra materials or transport costs
2. Supermarkets overprice the half-dozen eggs to induce customers to buy the dozen as it's better value. 

I'd bet it's more likely to be number 2.