Explanation:

- Necessities: These goods are essential for survival, like food and water. They usually have inelastic demand, less than one. People buy them regardless of price changes.

- Complementary Goods: These are used together, like bread and butter. A change in the price of one affects the other, but not significantly, having elasticity less than one.

- Luxury Goods: These are non-essential items, like expensive watches and cars. Their demand is more sensitive to price changes, giving them elasticity greater than one.

- Comforts: These are desired for relaxation and convenience, like furniture. Their elasticity varies but is generally less than luxury items.