The Progressive Discount Mechanic Explainer

Act as a clear communicator. Help me write the on-site copy that explains a "Buy More, Save More" automatic discount mechanic that applies as customers add more items to their cart.

• Discount Tiers: [e.g., "Buy 2, Get 10% Off Entire Order; Buy 3, Get 15% Off; Buy 4+, Get 20% Off"]

Task: Write a clear, concise message for the shopping cart page. It should dynamically update as items are added, showing the customer their current discount and what discount they would unlock by adding one more item. Make the math and the benefit utterly clear.