Jay saved $200 to purchase a Zowie digital camera following her friend showed Jay the Zowie she purchased for $200 at a close by camera store. Fortunately the camera was on sale for $150 all through a one-hour ‘Manager’s Special’ sale when Jay ultimately went to the store. Jay utilized the unexpected $50 discount to purchase a case and a memory card. The purchase of case and memory card is an illustration of the: (i) Substitution effect. (ii) Paradox of value. (iii) Law of diminishing marginal utility. (iv) Income effect. (v) Utilitarianism principle.
What is the right answer?