Income increases would have a bigger impact on the market.
Explanation:
For example, if the good is an inferior good (for example Top Ramen), higher income would mean lesser demand for that good. If it is a normal good (like seafood), however, higher income would mean higher demand.
If the good is inferior (and you have a higher income) and a complementary product price decreases, your demand still wouldn't change. You'll probably buy a little less seafood and only a little bit more top ramen.
