Final answer:
The term that economists use to describe when a shopper gets a "good deal" on a product is discount. Impulse buys or impulse purchases are low-priced products that consumers buy frequently without any planning.
Step-by-step explanation:
The term that economists use to describe when a shopper gets a "good deal" on a product is discount. A discount is a reduction in price, often provided by retailers to incentivize customers to purchase their products. Discounts can be temporary or permanent, and they can take different forms, such as percentage-off deals, buy-one-get-one-free offers, or bundle discounts. These low-priced products that consumers buy frequently without any planning can be referred to as impulse buys or impulse purchases.