A decrease of the price of a substitute good would cause the demand curve of the good in consideration to shift to the left. Because restaurant meals are a substitute for preprepared meals, the decrease in the price of restaurant meals will cause the demand curve for prepared meals to shift to the left.
A change in the price of the good under consideration cause a movement ALONG the demand curve, not a shift of the entire demand curve.
If consumer income increases, the demand curve for all normal goods will shift to the right.
A change in the supply of a good will cause a change in the price of the good. This is a movement ALONG the demand curve instead of a movement of the curve itself.
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