Key Performance Indicators (KPIs) to measure cross-selling success include:
1. Cross-Sell Ratio: The number of additional products sold per customer.
2. Revenue per Customer: Total revenue generated from cross-sold products.
3. Customer Retention Rate: Percentage of customers who continue to buy after cross-selling.
4. Average Order Value (AOV): The average amount spent per transaction including cross-sold items.
5. Conversion Rate: The percentage of customers who purchase additional products when offered.
6. Customer Lifetime Value (CLV): The total revenue expected from a customer over their relationship with the business.