Which retail innovation significantly increased candy sales by targeting shoppers during a specific moment in the shopping experience?

Retail psychology plays a crucial role in food marketing, especially when it comes to impulse purchases like candy. Grocery stores have perfected their layouts to maximize sales through strategic product placement. This trivia tests your knowledge about one of the most successful retail placement strategies that has boosted candy sales for decades. How much do you know about the psychology behind grocery store layouts?

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Candy placed at the checkout lanes (the 'checkout counter candy strategy')
Candy displayed in the frozen food section (the 'temperature contrast display')
Candy positioned at store entrances (the 'welcome sugar boost')
Candy integrated into the produce section (the 'guilt-balance placement')