Foreword: hopefully this relates to HN as it is business/price-setting related, which could be related to startups.
Well, a 4-pack of 250 ml Red Bull cans costs around five dollars (at Walmart). That is an average price of $1.25/can.
A 24-pack of 250 ml Red Bull cans costs around 42 dollars (http://www.amazon.com/Red-Bull-Energy-Drink-Sugarfree/dp/B000MTM0WK). That means 42/24 = $1.75/can.
At Walmart also, a 12 pack of 250 ml Red Bull cans costs 20 bucks. That is 20/12=1.66 per 250 ml can.
So, 1.25 (4-pack) < 1.66(12-pack) <1.75(24-pack).
The question is: WHY?
Shouldn't a properly run pricing strategy encourage customers to buy more, not discourage them? What's going on exactly?