Final answer:
The foot-in-the-door technique is a persuasive strategy where a small request is followed by a larger request, which people are more likely to comply with. It is commonly used in sales and marketing.
Step-by-step explanation:
The phenomenon described in the question is known as the foot-in-the-door technique. It is a persuasive strategy where a person is initially asked to comply with a small request and then later presented with a larger request, which they are more likely to agree to due to their previous compliance. This technique has been demonstrated in various studies and is commonly used in sales, marketing, and even interpersonal relationships.