Market demand curves normally slope downwards. They may also shift from D1 to either ${D_2}$ or ${D_3}$.
What would cause a movement along D1 for good X and not a shift to either ${D_2}$ or ${D_3}$?

1 )
advertising of good X increases sales
2 )
consumer incomes rise
price of good X falls
4 )
price of other goods falls
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