Final answer:
Tying sales is a sales technique that requires a customer to buy a second product if they want to purchase a related product. This can lead customers to spend more. Bundling is another concept where multiple products are sold together for a better price.
Step-by-step explanation:
The sales technique used to get a customer to spend more by purchasing a related product is called tying sales. This happens when a customer is required to buy one product only if they also buy a second product. Tying sales can be controversial because they force consumers to purchase products they may not want or need.
Another concept related to tying sales is bundling, where two or more products are sold as one. Bundling typically offers an advantage for the consumer, as they can acquire multiple products or services for a better price. For example, cable companies often offer special prices for bundled packages that include cable, internet, and phone line services.