\text{As income increases, the Marginal Propensity to Consume (MPC) typically remains constant.}
\[\text{Since the Average Propensity to Consume (APC) is calculated as } \text{APC} = \frac{C}{Y}, \text{ it decreases with increasing income. Hence, APC falls.} \]
\text{But since the MPC remains constant, APC rises initially and then falls as income increases.}