DUDE...the iPhone is 62% of the company’s revenue. If the GM on the overwhelming majority of Apple’s business were significantly higher than the 38% average, THE AVERAGE WOULD BE SIGNIFICANTLY HIGHER!!!!
Pardon me if I haven't read all 53 pages of accounts, but on a quick scan you all seem to be arguing over information that simply isn't there.
The 38% comes from (total net sales - cost of sales)/total net sales - or you can separate it out as 34% on product and 62% on services because Apple thoughtfully provide both net sales
and cost of sales for both of those categories. Its an overall figure,
not an average of anything.
For iPhones vs. Macs vs. wearables all they provide is a breakdown of net sales - there's no breakdown of how 'cost of sales' is allocated amongst these categories - and without that you simply can't work out the per-product margins. You can
assume that they're somehow evenly distributed between products (in which case, yes, the iPhone is going to dominate the figure) but that is a
big assumption and - in the context of this discussion about whether Apple gets a higher margin on certain products - a circular argument.
There's a lot more to 'cost of sales' than the bill of materials - labour costs, licenses and royalties, the notional cost of the included software (which could be any legally defensible figure per product that Apple chooses)* and basically any expense that can reasonably be associated with the process of selling goods and services, some of which don't even makes sense to allocate per product (ask your accountant whether the factory heating bill, subsidised meals at the warehouse canteen or Tim's hotel bill at WWDC are allowable here - better, ask 3 accountants and get 3 different answers). That's without all the possible shenanigans around deferring set-up costs and one-off income spikes over several years and other tax-optimising capers...
If Apple decides that the bundled software (and upgrade rights) are worth $200 per unit for an iPhone and $5 for a HomePod - or vice-versa - who is to argue with them, as long as they're consistent and their accounts meet legal standards? I'm not saying that's the case - I'm saying that nobody here knows what
is the case, and its actually irrelevant to the sort of public profit/loss accounts that you're referring to.
* Including, for example, "amortization of the deferred value of unspecified software upgrade rights, which are bundled in the sales price of the respective product" (p27) - i.e. whatever Apple thinks is a reasonable monetary value for all those iOS updates you're going to get during the life of your purchase.