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Total Utility and Marginal Utility

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The satisfaction someone receives from consuming commodities is called utulity.Total utility refers to the total satisfaction from consuming some commodity. For example, the total utility of consuming 10 units of any commodity is the total satisfaction those 10 units provide. Marginal utility refers to the change in satisfaction resulting from consuming a little more or a little less of the commodity. The marginal utulity of the tenth unit consumed is the additional satisfaction provided by the consumption of that unit, or in other words, the difference in total utility gained by consuming 9 units and by consuming 10 units.
The significance of this distinction can be seen by considering two questions: (1) If you had to give up consuming one of the following commodities completely, which would you choose: water or the movies? (2) If you had to pick one of the following, which would you choose: increasing your water consumption by 35 gallons a month (the amount required for an average bath) or attending one more movie a month?
In (1) you are comparing the value you place on your total consumption of water with the value you place on all your attendance at the movies. You are compering the total utility of your water consumption with the total utility of your movie attendance. There is little doubt that everyone would answer (1) in the same way revealing that the total utility derived from consuming water exceeds the total utility derived from attending the movies.
In (2) you are compering the value you place on a small addition to your water consumption with the value you place on a small addition to your movie attendances. You are compering your marginal utility of water with your marginal utility of movies. In responding to (2), some might select the extra movie; others might select the extra water. Furthermore, their choice would depend on whether it was made at a time when water was plentiful so that they placed a low value on obtaining a little additional water. (low marginal utility of water) or when water was scarce, so that they might put quite high value on obtaining a little more water. (high marginal utility of water)
Choices of type (1) are encountered much less commonly than are choices of type (2). If our income rises a little, we have to decide to have some more of one thing or another. If we find that we are overspending or if our income falls, we have to decide what to cut down on. Do we have a little less of this or a little less of tha

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