According to the law of demand, when the price of a commodity increases, the quantity demanded will:

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6. D. Decrease According to the law of demand, there is an inverse relationship between the price of a commodity and the quantity demanded. When the price of a commodity increases, the quantity demanded will decrease, assuming all other factors remain constant.

7. A. Cassava bread when income increases A normal good is a good for which demand increases as consumer income increases. Option A describes this behavior: if income increases, the demand for cassava bread increases. Options B and C describe inferior goods, where demand increases as income decreases. Option D also describes a normal good, but typically, in many developing economies, basic staples like Gari might be considered inferior goods for some income levels. However, option A clearly states the characteristic of a normal good.

8. C. The price of the commodity A change in quantity demanded refers to a movement along the demand curve, which is exclusively caused by a change in the price of the commodity itself. Factors like consumer income, preferences, or government policies cause a shift in the entire demand curve (a change in demand), not just a change in quantity demanded.

9. The question is incomplete. Please provide the full question and options for question 9.