What happens when price level and income are not constant in demand?

When the price level and income are not constant, demand can fluctuate significantly. An increase in income typically leads to higher demand for normal goods as consumers have more purchasing power, while a decrease in income may reduce demand. Conversely, if the price level rises, consumers may buy less due to decreased purchasing power, leading to a potential decrease in overall demand. These changes can shift the demand curve, affecting market equilibrium and influencing economic activity.