CHICAGO--(BUSINESS WIRE)--Shopper sentiment surged in Q1 2015 amid optimism over the labor market, job stability, personal finances and gas prices, according to the latest IRI MarketPulse™ survey. While a Q1 jump has occurred for several consecutive years now, this year’s spike marks the largest jump in IRI’s Shopper Sentiment Index™ since it was launched in 2011. “Consumers tend to start each new year with a modicum of optimism,” notes Susan Viamari, editor of Thought Leadership, IRI. “The fac