Your choices will involve the comparison of marginal cost and marginal benefits for each good considered.
Marginal cost is the additional cost generated by purchasing an extra unit of a good. For example, if the cost of buying 10 units of a good is 100 and the total cost of buying 12 units is 120. Marginal cost is: (120 - 100) / (12 - 10) = 10
Marginal benefit is the change in total benefit as consumption is increased by one unit. Satisfaction is maximised when marginal cost is equal to marginal benefit.
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