“In the quarter ending June 2011, Apple spent less than $1 billion on property, plants, and equipment,” Nicholas Carlson reports for Business Insider.

“By March 2012, the number had spiked beyond $2 billion, beyond $3 billion, and approached $4 billion,” Carlson reports. “Horace Dediu thinks that number will zoom past $4 billion in 2013.”

Carlson reports, “Here’s the the interesting part about all this massive spending. No one outside of Apple knows where it’s going. ‘The capital is being deployed almost silently and, though vast in scale, barely gets a mention from analysts,’ writes Dediu. ‘Not even a single question has been raised at any earnings call about this spending.’ His theory is that Apple, which prefers an ‘integrated’ approach in everything it does, will soon make more of the components inside its gadgets, like chips.”

Read more in the full article here.

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