The a change in these factors would lead to a shift for the demand curve for a good: price of related goods and income
The demand curve shows the relationship between the price of a good and the quantity demanded of that good.
All things remaining equal, the higher the price of the good, the lower the quantity demanded and the lower the price of the good, the higher the quantity of the good demanded. This explains why the demand curve is negatively sloped.
A change in the price of a good would lead to a movement along the demand curve for that good.
These factors would lead to a shift of the demand curve a good
1. The price of other goods : Assume that pen and pencils are substitutes. If the price of a pen increases, it becomes more expensive relative to pencils. As a result, the demand for pencils will increase. This would lead to a rightward shift of the demand curve.
2. Income : if the income of a person increases, the person would be able to buy more quantities of goods and services. This would lead to a rightward shift of the demand curve for those goods.
Please find attached images of the demand curve
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