While out this weekend, I heard the local tamale guy yelling.
He or the women who works with him are out now and then with a push cart selling tamales. They're both loud enough that you can hear them a quarter mile away.
The first time I heard them, I had no idea what they were selling. They're LOUD but not clear. Another runner took a detour from a group run and came back with half a dozen tamales.
You either know what they're selling or someone tells you as they run by.
Literal word-of-mouth marketing.
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Customer behavior analysis for better Shopify store performance
The Shopify App that increases repeat customer purchases through customer behavior analysis.