Explain how the data in Extract A show that privatised water companies have exploited their monopoly market power.
| 2017 | 2018 | 2019 | 2020 | 2021 | |
|---|---|---|---|---|---|
| Average annual household bill (£) | 395 | 410 | 425 | 440 | 465 |
| Average operating & infrastructure cost per bill (£) | 280 | 265 | 270 | 260 | 265 |
| Company operating profit per bill (£) | 15 | 45 | 50 | 75 | 90 |
