Sales promotion consists of short-term incentives to encourage immediate or earlier purchase of products and services. Whereas advertising focuses on reasons to buy, sales promotion emphasizes reasons to buy now. Sales promotion makes up 77% of marketing expenditures on average for consumer packaged goods companies. Popular sales promotion techniques include buy-one-get-one-free offers, loyalty programs, discounts, coupons, competitions, and free samples. Marketers must carefully plan sales promotion programs by determining incentive size, participation criteria, promotion period, and evaluating the program's effectiveness and returns on investment.