| Clue | Source | Date |
|---|---|---|
| Unchanging charge | Newsday | 10 Mar 2024 |
| Unvarying price | Eugene Sheffer | 30 Mar 2020 |
| Unvarying charge | New York Times | 17 Mar 2019 |
| Unvarying charge | ||
| Unvarying charge | Wall Street Journal | 28 Jul 2018 |
| Unvarying charge | ||
| *Monthly charge for a London apartment? | New York Times | 15 Nov 2017 |
| *Monthly charge for a London apartment? | ||
| Like some etail shipping | ||
| It's the same for all customers | ||
| Unvarying price per unit | ||
| Set price | ||
| Set price. |