'Existing normal goods X and Ylsubstitutes for each other), the price ofX is E5\

Existing normal goods X and Y(substitutes for each other), the price of X is B, and the price of Y is py; Let's call the consumer's income M. Please adopt ordinal utility theory in consumer choice behavior to analyze: Briefly describe the similarities and differences of income effect, substitution effect and price effect between normal goods and low-grade goods.