The only mix which generates revenue is _________.

Price

The only mix that generates revenue directly is: Price

Here's why the other options do not generate revenue directly:

• Place: This refers to the channels and locations through which a product or service reaches the customer. It facilitates access to the product but doesn't directly generate revenue.
• Product: The product itself, with its features and benefits, attracts customers and creates value. But without a price attached, it wouldn't directly bring in revenue.
• Promotion: Promotional activities aim to create awareness, interest, and desire for the product but do not translate directly into revenue unless a price is set and customers actually purchase the product.