Called chained CPI, the new formula includes assumptions on consumer habits in response to rising prices, such as seeking cheaper alternatives, and would result in smaller benefit increases in future years.

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"Angry Birds' proven formula for fun and addicting gameplay translated perfectly to the big screen and the consumer response has been overwhelming, " said Jennifer Mirabelli, VP of Sales and Marketing for Activision Publishing, Inc.

ENGADGET: Angry Birds Trilogy flutters to Wii / Wii U in celebration of one million sold