The inverse relationship between price and quantity is called the law of demand. When the price of the commodity increases, demand for the commodity decreases; if the price of the commodity decreases, the demand for the commodity increases. Let's see the assumption for this law.

Assumption
1) No changes in the income
2) No changes in population
3) No changes in price of the related goods
4) No changes in the tastes and preferences of consumers
5) No expectations for future price reduction
6) No changes in climate conditions

Table

Diagram

Explain
(X) axis quantity of demand units, (y) axis price of the commodity. When the price of the commodity is 2, demand for that is very high. If the price of the commodity starts to rise, the quantity of demand is declining. That's why the demand curve slopes left to right downward.