Taxing the phone or the company’s margins should have the same effect, right? They’re both costs on apple’s revenue. Barring maybe some enforcement issue or something it makes no difference how you collect it, Apple will pass some of it off to their customers and eat another percentage based on whatever the new cost/demand curve looks like to them.
My argument is that since apple can move the price, if you tax the company they increase the cost of the phone as much as makes sense and eat the rest. If you tax the phone, they leave as much as the increase on the cost to the end user as makes sense and lower the price beyond that, eating it. In neither case are profits or demand going to zero.
And a tax on the phone does this, so they either lower the cost and eat it, or suffer the same fall in demand as when the price of the phone increases to protect their margins.