In a single eureka moment he figured out that by giving away the integrated development environment (IDE), IBM could kill its competition, open all doors, and sell its most expensive product.

• 汽车销售商所赠礼品的价值和一辆汽车的利润比起来真是无关痛痒。但是，这些幕后因素丝毫不影响我们对“免费”的痴迷。但是，“免费”这个概念是否会让我们陷入一个危险的境地呢？