Read the paragraph and answer the question. Techniques which are used to win customers include coupons, samples

Read the paragraph and answer the question. Techniques which are used to win customers include coupons, samples, money back, competitions, etc. Many of these techniques are over a hundred years old. new promotion techniques are not often developed and, even when they are, there is always a risk that they will not please customers. So why do companies still try to develop new promotion techniques? The answer is because companies which do develop a successful new promotion can win many customers because they are the first to use the technique. Why do companies need to develop promotion techniques?