A consumer consumes one unit of a good to gain a utility of 50

The marginal utility that the consumer obtains by consuming a third unit of the good.

is 31 and is calculated as follows:

Because the marginal utility can be used for new consumption.

Calculated in increments of total utility per hour of goods or services.

Extended Resources:

Marginal Utility Translation"Boundary utility"。An important concept of marginal utility axiology. Refers to the minimum utility of the last unit of consumption, i.e., the marginal unit. Austrian economist.

Menger, the British economist Jevons, and the French economist Walla put forward the marginal utility theory of value from 1871 to 1874, arguing that the value of a commodity depends on people's subjective evaluation of its utility. When people consume a commodity, the utility of the increase decreases with each additional unit; The last unit of consumption has the least utility; Determine the value of the commodity.

, not its maximum utility, nor its average utility, but its minimum. Menger's student, the Austrian economist Wiesel.

Let's start with this minimum utility"Marginal utility"。

Marginal utility is the degree of satisfaction that increases for each unit of consumption of a certain good. The meaning of marginal is incremental, which refers to the independent variable.

Increase the dependent variable caused.

The amount of increase. In marginal utility, the independent variable is the consumption of an item, while the dependent variable is the degree of satisfaction or utility. The change in utility caused by the change in consumption is the marginal utility.

Value Paradox:

The theory of marginal utility can also explain the famous ones in economics"Value Paradox:"。The value paradox, also known as the mystery of value, refers to the fact that some things have great utility but are very low (e.g., water), and some things have little utility but are very high (e.g., diamonds). This phenomenon is inconsistent with the traditional ** theory.

The paradox of this value is Adam Smith.

Proposed more than 200 years ago, it was not until the marginal utility theory was proposed that a satisfactory answer was given. The key to explaining this problem is to distinguish between total utility and marginal utility. The total utility that water brings to us is enormous, and we cannot survive without it.

But the more we consume something, the smaller its marginal utility will be. We use a lot of water, so the marginal utility of that last unit of water is negligible. Conversely, the total utility of a diamond relative to water is not great, but since we buy very few diamonds, its marginal utility is greater.

According to the theory of marginal utility, consumers distribute their income in such a way that the marginal utility of each expenditure on all goods is equal. It is also according to this principle that income is allocated between water and diamonds: the marginal utility of diamonds is high, the marginal utility of water is low, and the marginal utility of each expenditure on diamonds and water can only be equal if the grid of diamonds is divided by its high marginal utility, and the low utility of water is divided by its low marginal utility.

So, it is reasonable that diamonds are high and water is low. In other words, it is a rational behavior for people to pay for diamonds with high marginal utility and low for water with low marginal utility. "Scarcity is expensive"The truth lies in"Thin"The marginal utility of the item is high.

The marginal utility gained from consuming a third unit of the commodity.

for 31Because the marginal utility can be used for new consumption.

It is calculated as an increment in the total utility of a good or service.

Equilibrium conditions for maximizing utility according to consumers:

mu1/mu2=p1/p2

Among them, by the available:

mu1=dtu/dx1 =3x22

mu2=dtu/dx2 =6x1x2

x1=9，x2=12

Therefore, the amount of Piqing slag purchased by the consumer per year for these two commodities should be: u=3x1x22=3888

Equilibrium conditions for maximizing utility according to consumers:

mu1/mu2=p1/p2

Among them, by the available:

mu1=dtu/dx1 =3x22

mu2=dtu/dx2 =6x1x2

x1=9，x2=12

Therefore, the number of these two goods purchased by the consumer per year should be: u=3x1x22=3888

I don't know how to get it.

The derivative of x1 yields mu1; The derivative of x2 yields mu2

Mistake. Not total utility but marginal utility.

Utility is greatest when consumers are most satisfied.

The principle of consumer utility maximization is a phenomenon that indicates that consumers choose the best combination of goods, so that the marginal utility brought by the last yuan spent on various goods is equal (that is, the ratio of the marginal utility of various goods purchased is equal to that of **), and is equal to the marginal utility of money.

The total utility that the consumer gets from each commodity is equal to the ratio of their **, respectively, and he will get the maximum utility.

It can be reached, but it will not be reached. 】

For example, if a user buys an induction cooker, it can be fried and fried (1) It is impossible to use it 24 hours a day; (2) It is impossible to use only an induction cooker for cooking, so [the maximum utility will not be obtained.] 】

The equilibrium condition for maximizing utility is:

The ratio of the marginal utility of each commodity to ** is equal.

Not total utility.

Option A is more appropriate than option D for this question, as follows:

In economics, the law of diminishing marginal utility refers to a law of diminishing utility that consumers get from each consumption unit of the commodity continuously increasing under the condition that the consumption of other commodities remains unchanged in a certain period of time, as the consumer's consumption of a certain commodity increases. That is, when the increase in input exceeds a certain level, the output per unit of additional input decreases.

Total utility refers to the total degree of satisfaction obtained from consuming a certain quantity of a certain good. The magnitude of the total utility depends on the level of consumption of the individual, that is, the greater the amount of goods and labor consumed, the greater the total utility.

According to the definitions of marginal utility and total utility, the diminishing marginal utility is that the marginal utility will decrease when the consumer consumes a certain amount, and when the marginal utility is greater than zero, the total utility will always increase, but the increasing speed is different, so it is more appropriate to choose A than option D in this question.

b.The total rubber impulse utility obtained by the consumer is diminishing.

c.The marginal utility obtained by the consumer is increasing.

d.The marginal utility obtained by the consumer is diminishing.

Correct answer: d

a.The total utility obtained by the consumer increases.

b.The marginal utility obtained by consumers is reciprocated.

c.The total utility obtained by the consumer is diminishing.

d.The marginal utility obtained by the consumer is diminishing.

Correct Answer: The total stool celebration utility obtained by the consumer increases; The marginal utility obtained by the consumer is diminishing.

Answer]: B Knowledge Point] The meaning of the marginal substitution rate of commodities;

The marginal substitution rate of a good refers to the quantity of another good that a consumer must give up when he or she increases the number of goods that he or she has to give up when he or she sells a good order at the same level of utility.