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?