Goods are described as inferior if their demand decreases as income increases. In other words, when people's income rises, they tend to buy less of these goods and switch to more expensive alternatives. This is because inferior goods are often considered lower quality or less desirable compared to other options available in the market.
For example, let's say that someone's income rises and they can now afford to buy more expensive cuts of meat. They may start to buy less ground beef, which is considered an inferior good, and more expensive cuts like steak. This is because they can now afford to buy better quality meat, which they perceive as more desirable.
On the other hand, if the price of a good increases, its demand is likely to decrease regardless of whether it is an inferior or a normal good. This is because as the price of a good goes up, people tend to look for cheaper alternatives or reduce their overall consumption of that good.