I am struggeling to structure a profitability case properly when considering several revenue segments. I use the profit=revenue - cost equation and use price, quantity and mix as a first layer. In the mix I check product segments, customer segments etc. Let's say there are three different product segments and all of them see a decline in revenues. I will ask price and quantity for each revenue segment and also consumer trends, competition, distribution, and even costs. So I feel like I won't go back to my first layer with price, quantity, and mix and cover everthing (even the cost aspects) in the "mix" section once I identified different product groups or even consumer groups because prices and costs might differ between them. So I am basically stuck with my mix the whole time.
Appreciate any help!