It’s been a wild week for Nintendo Co., which has seen its market value jump by 1.5 trillion yen ($14 billion) amid record volume. Shares began surging last Friday after the release of mobile game Pokemon Go set off a worldwide frenzy, sending the app to the top of charts in every market where it’s available. The excitement also triggered a boom in trading, with more than 53 million shares exchanging hands over the past week, about the same amount that traded during the previous four months.

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