The subject is Customer Behavior. 2 question thx

Mary wanted to buy a new notebook for her study and she collected advice from her classmates and good friends before making purchase. She bought a Samsung notebook after receiving some positive word-of-mouth information from her good friends. Question 1 When decision making is based on low effort like Mary's case, how does the law of small numbers bias judgements based on the availability heuristic? Question 2 Based on Mary's purchase situation, explain to her the major differences between the high-effort hierarchy of effects and the low-effort hierarchy