The table below shows the change in the weekly demand for artisanal sourdough bread in a suburban town following a change in average household income.
| Year | Average annual household income | Weekly quantity of artisanal sourdough bread purchased |
|---|---|---|
| 2022 | £40,000 | 800 loaves |
| 2023 | £50,000 | 1,120 loaves |
Based on this information, artisanal sourdough bread is best classified as a:
Normal necessity
Superior (luxury) good
Inferior good
Complementary good
