That's a pretty general question Sebastian. Kind of like "how high is up?".
Big companies utilize many different distribution channels and pricing structures. Depending on the channel, the product could go through several hands before reaching the end consumer, with each hand getting a piece of the action. Then there's also the case of a huge chain buying direct and through sheer volume getting deep discounts (such as in the case of Walmart, Target, or Costco).
Then there's also different classes of products within each category. Some classes command a higher retail price, even though the COGS is the same, (or maybe even less than) as a similar item in a different category or demographic.
Take Kit Kat for example. Here in North America a 55g Kit Kat bar is $1.00 at best.
Not in Japan. Japan is Kit Kat crazy. An 11 gram single finger is $2.24! That would make a 55g bar the equivalent of $11.12 here in Canada!
Nobody anywhere is going to convince me that Nestle's margin on a north american kit kat is the same percent as the margin on a Japanese Kit Kat, and while producing about 1.5 BILLION kit kat mini's per year just for Japan, their margin - even IF small - most likely makes Warren Buffet hard.
Hmmmm..... I don't think I'm charging enough for my bars....