View attachment 43712
Explain utility and the law of diminishing marginal utility, then draw this graph.
Then explain that as according to every successive consumption of a good, the Marginal utility falls. Now according to demand curve, a consumer would be ready to pay less for a product which yields less satisfaction compared to the previous one consumed. Due to this, the demand curve is downward sloping.
Now you can explain how this is not true in case the good is a luxury or explain paradox of value by Adam smith.
thanks a lot....