[lazypenguin]

I generally agree with you but there is the case for negative revenue that could deplete those reserves at a rate faster than you have calculated.

[fauigerzigerk]

How would that negative revenue come to pass? People returning their iPhones en masse for a refund?

[perseusprime11]

You end up spending lot more money than you make. To counter that, you invest $20 billion dollars in a game changing innovation but it fails leading to a write off. Then you go acquire a company that also becomes a dud. There are 100 different ways to go broke. Take a look at how GE messed up.

[fauigerzigerk]

Absolutely, but that's not negative revenue.