Final answer:
The type of consumer buying behavior with low involvement and few brand differences is routine response behavior. This is where consumers purchase quickly with minimal effort due to product familiarity and low cost.
Step-by-step explanation:
The type of consumer buying behavior that has low consumer involvement and a few differences between brands is known as routine response behavior. This behavior implies that consumers make purchase decisions for such products almost automatically and with little thought or effort, often because the products are inexpensive and familiar. In contrast, limited decision making involves a moderate amount of effort in gathering and evaluating information when there are a few significant differences between brands. Extensive decision making is a more complex process requiring a lot of information and time to make a decision, often for high-involvement purchases. Lastly, impulse buying behavior happens spontaneously and without a pre-planned intention to buy.