But an example of flexible flat-rate pricing might be trash removal. It is generally billed at a fixed-rate, regardless of how full or empty the container is. The amount of the fixed-rate, however, depends on the size of the container you selected. For time-sensitive billing, examples abound. Cellular air-time comes to mind as does sitting in your attorney's office.
Analogies also exist in the telecommunications field.
Basic phone service, which once was and in many cases still is billed at a fixed rate, is an example of universal fixed-rate. When telcos realized that businesses use a disproportionate amount of phone service when compared to residences, flexible fixed-rate kicked in, with businesses paying a higher rate than residences for monthly service. Next in the progression, but which is not yet implemented in all areas, is measured rate service, where local calls are billed at a unit-sensitive basis. For some locations, the trend in local calling is moving towards time-sensitive billing, which as earlier discussed is the most equitable approach. Long distance has always been billed in a time-sensitive manner.