1-All shift in demand curve not follow law of demand but demand curve is obtained from law of demand?why?
2-Giffen goods income effect is negative and greater than substitution effect so that price effect of a positive relation between price and quantity demanded of a commodity?What is meant by this?In study material it is wrong?
3Law of demand fail income effect is greater than substitution effect why not fail when income effect is less than substitution effect?


Law of demand fails when income effect is greater than substitution effect. This is because the total price effect will be positive in that case. On the other hand, price effect will be negative when substitution effect dominates the income effect and thus law of demand does not fail in this case. 

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