The table below shows the change in the demand for a certain consumer product following a change in average household income. What type of good does this information indicate the product is?
| Year | Average annual household income | Quantity of product purchased per month |
|---|---|---|
| 2022 | £40,000 | 50 |
| 2023 | £48,000 | 35 |
Inferior good
Normal good
Complementary good
Superior good
