Apple's iPhone issues stretch far beyond China — and its recent sales warning could be the tip of the iceberg

There are two important factors to consider when trying to make sense of Apple's warning that its holiday quarter revenue would fall billions short of expectations.The problems Apple saw in China go far beyond just Apple.But Apple's iPhone problems extend far beyond China, too.
There was a collective thud Wednesday as Apple warned that its holiday quarter revenue would fall billions short of expectations amid exceptionally weak business in China.
The backdrop: There are two impor