What factors determine whether a good is classified as a normal good, and how does consumer behavior change in response to shifts in income levels affecting the demand for normal goods?

The classification of a good as a normal good is determined by how consumer demand changes with income levels. When income increases, demand for normal goods also increases. Conversely, when income decreases, demand for normal goods decreases. This is because consumers have more purchasing power with higher income, leading to increased consumption of normal goods.