Tim Cook’s Apple is hot. But can it keep going?

Too much iPhone reliance. Apple is hugely reliant on the iPhonethe iPhone accounts for 69% of Apple’s revenue. That’s a potential problem, because smartphone sales are slowing in most of the biggest iPhone markets.

In the United States and Western Europe about 70% of cell phone customers own a smartphone. Going forward, smartphone sales will likely only grow by about 5% to 10% a year, according to Colin Gillis, analyst at BGC partners.

Related: Apple has mind-boggling $178 billion in cash to spend

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