Answer: See explanation
Step-by-step explanation:
1. Inelastic demand occurs when a change in price doesn't really have an effect on the quantity of the goods demanded. Examples of products with inelastic demand are salt and prescription drugs.
2. Elasticity for demand helps in the determination of the prices of factors of production. It is also vital in knowing how price changes will affect the revenue of the firm.
3. Normal goods are the goods that when income increases, the demand for them increases as well e.g. household appliances
For inferior goods, when Income increases, their quantity demand reduces. These are common with extremely cheap products.