To me, you are still nothing more than a little boy who is just like a hundred thousand other little boys. And I have no need of you. And you, on your part, have no need of me. To you, I am nothing more than a fox like a hundred thousand other foxes.
Randomized evaluations can help us understand what works and what doesn't in development.
起初,这些产品都是一个大胆的赌注,明智的人(常常)担心它们无法成功。当我们在9年前推出Prime服务时,它是一种新鲜的、未经实践证明的(有些人甚至会说是鲁莽蛮干的)概念: 无论什么物品都提供两天内送货上门的服务,而客户只需支付很少的包年费用。