The incentive in this question is the free sample that was offered to the customers when they purchase the large bottles. While the trade off is the smaller bottles that were offered that costs less than the large bottles.
This is the term that is used to refer to the fact that a person is being offered something in order to carry out an action. The term incentive has to do with a payment or an inducement that could motivate a person. The free samples were offered to encourage people to buy more of the larger bottles.
This is the term that is used to refer to the point of balance. At this stage a sacrifice has to be made.
Read more on trade offs here:
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