Which metric showed the strongest correlation between celebrity endorsements and retail sales in Nike's landmark 2021 marketing effectiveness study?

Celebrity endorsements have become a cornerstone of modern retail marketing strategy. When a famous face attaches to a product, consumer perception and purchasing behavior often shift dramatically. This poll tests your knowledge about the fascinating intersection of celebrity influence and retail consumer trends. Do you know which surprising metrics actually measure the true impact of star power in the retail space?

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Social media engagement rate of the celebrity (likes, shares, comments)
Perceived authenticity score (match between celebrity lifestyle and product)
Celebrity's follower count across all platforms
Frequency of celebrity appearances in mainstream media