Assuming ramen noodles are an inferior good, a decrease in income will shift the demand curve to the left.
Inferior goods are goods for which demand decreases as consumer income increases, in contrast to the opposite observed for normal goods. Common goods are goods for which demand increases as consumer income increases.
An inferior good is a type of good whose demand decreases as income increases. In other words, the demand for inferior goods is inversely proportional to consumer income.
Typical examples of substandard goods include "private label" groceries, instant noodles, and certain canned or frozen foods. Some people have a particular fondness for these items, but most buyers prefer to purchase more expensive alternatives if they have the income.
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