Numerous factors can lead to a decrease in demand. Consider the demand for ramen noodles. Many college students report that this is an inferior good, a common part of their diet because their income is low. What factors would cause the demand for ramen noodles to fall?

Since they are an inferior good, an increase in income would cause demand to fall, as students could afford something they like better. A fall in the price of macaroni and cheese (a substitute), an increase in the price of a complement (maybe really cheap wine?), an expectation of falling prices on ramen noodles later in the week, and possibly a change in taste brought on by any number of factors (for example, the stars of a popular TV show making fun of ramen noodles), would all decrease the demand for ramen noodles.

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