If the scope is fixed, you're selling a product. That product might be a one off, and it might be purely a service product, but it's still a thing to be sold at

If the scope is fixed, you're selling a product. That product might be a one off, and it might be purely a service product, but it's still a thing to be sold at a price. Generally consultants are not selling a product. They are hired to bring knowledge and experience to a team, to be there when needed, and to offer flexibility for which it would be time and cost prohibitive to develop an internal employee.