Sales promotion techniques are used to incentivize consumers and retailers to purchase products. For consumers, common incentives include coupons, samples, rebates, and contests. The objectives are to generate interest, inquiries, traffic, repeat purchases, and increased purchase rates. For retailers, trade promotions provide incentives like allowances and contests to encourage inventory builds and promotional cooperation. However, trade promotions can cause issues like opportunism, forward buying, and demand spikes. Effective promotions require a good product that can retain customers after incentives end to avoid losing promotional gains. Excessive promotions may diminish returns and devalue brands.