what influences customers to buy?

If an organization knows what influences its potential customers to buy, they can make effective marketing campaigns to meet the needs of those customers. Provide two things that you believe influences consumers to buy. How would you, as a marketer, focus on these influences to increase sales?  please be detailed but it only needs to be 150 words.  so one or two simple paragraphs are fine.  as long as the required questions are answered.  Thanks