There are various types of revenue streams for a company. Some of these are fixed and some are variable. A fixed revenue stream is something that a company is not changing or taking away from its customers. For example, say you have a product that is selling well and you want to increase the sales by increasing the price of your product. You can raise the price by taking the money from your current customers and selling it to new customers who have no idea about your product. The other type of revenue stream is one where you can change or take away some features from your product, but not much as it would be very difficult to do so in an automated way (for example, if you were going to change this feature in an automated way, then it would be very difficult).