Chelmsford, Mass. -- It only take an average of 2.2 negative experiences for Americans to stop purchasing from a retail brand -- across any channel, according to a new survey commissioned by Kronos Inc. Underscoring the urgency of a seamless omni-channel experience, 68% of Americans agree that a negative shopping experience within a single channel negatively impacts their perception across all shopping channels including physical stores, online, mobile, phone centers, and catalog.