10. Know the Markdown Policies
Knowing the markdown policies of the store help hagglers save money. Most stores will adjust the price of a previous purchase if the item was marked down within a certain time from when it was bought. This can range from two weeks to a month in most stores. By knowing the store policy, the haggler knows when to return to check the price of something they already bought. If it is lower, they then ask for an adjustment. This brings up one last important point - hagglers never throw away a receipt.

10. 清楚减价规律

弄清商店的加价规律，可以帮砍家省很多钱。大部分的商店都会在物品售出后的一定时间调整一件物品的价格。这可能是两周，或是一个月。弄清减价规律，砍家就知道什么时候去查证他们已购物品的价格。假如降价了，他们就要求调价。这就引出了最后的重要的一点---砍家永远都不会扔掉收据。