Google made an extra $8 billion last quarter but won't say how. I have some guesses.

Google reported an $8 billion gain on a company it's invested in. But which one?

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• Imagine making an extra $8 billion and not really caring about it.
• That's Google, right now: The company says the value of one of its investments increased by $8 billion this quarter, but won't say which one.
• I have some ideas.

Most companies would make a big deal if they found an extra $8 billion in their couch cushions.

Google is not one of those companies.