为什么有些购物者总能买到最上算的东西，而其他人得到的却是些“残羹剩菜”呢？其实，精明的购物也是有许多秘诀的。遵循规律购买物品必须遵循商品的生命周期，选择最佳时机。商品的生命周期一般分为：开拓期、成长期、饱和期和衰退期。开拓期产品刚上市，产量少，质量性能不 Why do some shoppers always get the best deal, while others get some “leftovers”? In fact, there are many secrets to smart shopping. Following the law to purchase goods must follow the life cycle of the goods and choose the best time. The life cycle of commodities is generally divided into: development period, growth period, saturation period, and recession period. The product during the development period has just been listed, the output is small, and the quality performance is not