Q6 (i) Consider the technique of direct price discrimination via which different prices are set for exogenously segmented sectors of demand

Q6 (i) Consider the technique of direct price discrimination via which different prices are set for exogenously segmented sectors of demand. Explain: (a) how prices should be set; (b) what a supplier needs to know to do; and (c) what constraints are faced in the use of this technique. (ii) Describe a real-world example of this price discrimination strategy, and relate it to your three explanations (a), (b), and (c) in part (i) 

for this question i will need references of the information, and please use real-world example on The Pink Tax in the US.