Considerable effort is required to get customers for your products. You design killer web pages, work hard for high search engine rankings (or pay for them), submit classified ads, etc. but still do not manage to sell enough. This is where the concept of back-end sales is useful.

Most marketers are successful because they apply back-end selling into their marketing efforts. Back-end selling is when you sell other products or services to your existing customers after they have purchased an initial product.

It is always easier to sell products or services to your existing customers because you have developed a relationship with them when you sold your first product or service to them. You will find it less expensive to sell to old customers as compared to selling to new customers.

Your conversion ratio will be dramatically higher with existing customers. Every time you continue selling back-end products or services to existing customers, you will be building a life-long relationship. You should continually bring out new back-end products or services to sell to existing customers.

Many businesses sell their front-end products (initial products) at almost zero profit in order to generate back-end profits. These businesses do not care even if they lose money on the front-end products or services; they want the back-end profits.

How do you make backend sales? There are several ways. When you order a product from a mail-order company, they'll send you a catalog along with your order, or put you on a mailing list and send you new catalogs from time to time. They might also send you a sales letter for another product. This may be related to the first product in some way. Many companies implement such a strategy.

To implement this technique on the web, you can put the sales pitch for your backend item in the email to the customer to confirm their order. If you have an online catalog, you could include a link to it, or even include a coupon or special offer "for all valued customers".

For a faster response, you should put the backend offer on the "Thank You" page that is generated by a credit-card sale. The customer just bought something from you and has a credit card in his or her hot little hand! Why not ask for another purchase while they are in the mood to buy. In case you do not sell more than one product or service, affiliate programs might come in handy. This way you can back sell products promoted by your affiliate programs as well.

Back-end selling can also be integrated with “Up-Selling” wherein you introduce more expensive products or services to your existing customers in similar ways as those mentioned above. This will almost instantly raise your sales and profits.