| Within a relevant range, the cost is usually remains constant. For example, you are buying frozen pizza in a box from the grocery store. One pizza can feed 3 guys. Step-fixed cost is the cost of the pizza, it is sold by the box, there is no partial pizza to be sold. The relevent range is the 3 guys, once it's more than 3, it goes up to the next level->need another box of pizza. When you have 4 guys waiting to eat pizza, you need to buy 2 pizza, not 1. |