请问vendor，agency和supplier 到底有什么区别？

supplier和vendor的定义在APICS里是对比出现的。

supplier有两重含义：1.provider of goods or service.

2. Seller with whom the buyer does business, as opposed to vendor, which is a generic term referring to all sellers in the market.

supplier和vendor的区别就体现在第二重含义里。对于一个组织来说，与之有业务关系的seller是它的supplier。而整个市场上能够提供某种产品和服务的都是vendor。

Agency是代理商，通常是指服务的供应商。