When growing a business, don't limit yourself to just one product or service. You may find that your initial product is the giveaway or must be discounted to gain the customer. It's in the upsell that you make the most money. This is especially true in the restaurant space. A burger joint makes very little on the burger. Their profit is found in the milkshakes and fries added to the order。

同样地，你的业务会逐渐扩大，你不能只将业务局限在某种产品或服务上。你或许会发现你的主打产品逐渐脱离市场或是你必须通过打折来吸引顾客。通过促销，反而赚更最多。尤其是餐饮业如汉堡店，他们销售的汉堡的利润很小，但利润主要来源于汉堡套餐中的奶昔和菜单上的油炸食品。

The hardest part is getting your customer in the door; increase your profit by adding on to their sale. What else can you offer?

其实销售最难的部分便是吸引你的顾客上门，推销套餐商品，获取更多的利润。除了这些你还能提供别的什么吗?

Some of the most important lessons in sales can be learned from the simplicity of a lemonade stand。

如果你还是不知道的话，可以来参观我侄女的汽水摊，从最平凡不过的汽水摊上学到一些重要的销售课程。