Army of GOD wrote:I could (maybe) understand how that may require them to be split,....
Because the price reflects the resources required for each service, and most importantly it shows how a change in A will result in a change in the profits (which are determined by the price).
For example, if they enact plan B for Streaming Services, the profit will be affected, but if profits decrease after plan B, how can you tell if the profit decrease was from the DVD service or from the streaming service?
In other words, if you aggregate the two business models under one price system, it becomes difficult to differentiate between the effects from each businesses' plans (i.e. plans for streaming and plans for DVD mail)
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Army of GOD wrote:...but to raise the price of both too (not just raising the price, but doubling the old, combined one)?
As for raising the price, why not? They expect to price out an acceptable amount of customers in order to increase total revenue. This revenue could go straight to profits, or maybe they're planning on expanding the services, but in order to do so, they need more money.
It just depends, and they're not going to tell you exactly why because then their competitors will know.