How to promote sales?

Sales promotion strategy is a kind of strategy often used in business transcation.A good promotion strategy,sometimes is a key factor of the success of a business.How to promote sales?There are some methods.
First,price strategy.A lower price may attract more customer's attention.The company can give a price discount to some certain products.
Second,package strategy.A fine package is important,because it can leave a deep impression on the buyers.
The last but not least,incentive strategy.Some small free gifts can increase the attractiveness of the products.so incentive can be a good way to promote sales.