Neo4j powers personalized promotion and product recommendation engines by connecting masses of complex buyer and product data to gain insight into customer needs and product trends. Traditional relational database technology is insufficient for real-time recommendations due to the complexity and speed required, whereas graph databases like Neo4j quickly query customers' past purchases and capture new interests in real time. This enables personalized promotion and recommendation algorithms that utilize a customer's past and present choices to offer timely suggestions. With a connected inventory, supply chain, and customer data system, retailers can implement dynamic pricing and competing promotions in real-time, making complex rules simple with Neo4j. Walmart and a top 10 US-based retailer have successfully implemented Neo4j in their production systems, improving performance, simplicity, and the customer experience.