There are four main types of buyer behavior: complex buying behavior which involves extensive research for high-cost purchases; dissonance reducing behavior which also involves research but with less careful consideration for mid-cost items; habitual behavior with little research for everyday low-cost items; and variety seeking behavior where customers switch brands regularly for novelty rather than dissatisfaction. Buyer behavior is also influenced by patterns like loyalty to certain purchase locations and tendencies to buy necessities in bulk versus luxury items in smaller quantities less often. Understanding buyer behavior is essential for marketing success.