What is marginal utility

Total utility refers to the sum of satisfaction obtained from the consumption of a certain amount of goods, expressed in tu. marginal utility refers to the satisfaction increased by each unit of consumption of a certain item, expressed in Mu. Total utility is equal to the sum of all marginal utilities up to that quantity; The marginal utility of consuming a certain quantity is the change of the total utility of the last unit. In addition, if the marginal utility is greater than 0, the total utility increases; If the marginal utility is less than 0, the total utility decreases; The marginal utility is equal to 0, and the total utility is the largest
Marginal utility is a constantly changing process. If you only know the total utility and don't know anything else, you can't calculate the answer supplement. Please write that formula clearly. X is different from * answer supplement, that is, find the first derivative of y to x, and y '= 20-4x is substituted to get the result of 0. Then the marginal utility is 0. Answer supplement 2x? Isn't the derivative of 4x? Believe me if you want to add the answer. This should be explained by derivation, which is not an ordinary algorithm. Substitute 5 into my formula, and the derivative is zero. At this time, the total utility does not increase or decrease, which means that the marginal utility is 0. The answer to add this question should be explained by calculus in high numbers, which is not easy to explain by ordinary mathematical methods, but the formula I get should not be wrong

Diamonds are very useful and expensive, but water essential to life is very cheap. Explain this phenomenon with the theory of marginal utility.. experts who understand it will help Use marginal effect to explain

The value of commodities is the embodiment of the use value of commodities. The drinking function of water and the decorative function of diamonds belong to the use value of commodities. The value of commodities is determined by social labor time. Obviously, in most parts of the world, the cost of water is much higher than that of diamond mining
The value of commodities is also related to the supply and demand of commodities. There is much more water in the world than diamonds. Although the consumption of water is much more than diamonds, relatively speaking, diamonds are still in short supply

Knowledge of Western Economics: Diamonds play a small role but are expensive, and water essential to life is cheap. Can it be explained by the knowledge of marginal utility Knowledge of Western Economics

It involves the law of diminishing marginal utility
Marginal utility = 0: necessities of life, such as rice and noodles
Drugs with marginal utility < 0:
Marginal utility > 0: investment goods, such as real estate whose price is expected to rise
Water belongs to the first and diamonds to the third
Air is more important to life than water, but now air is basically free
Diamonds, gold, high-end cars and other luxury goods are basically useless to farmers living in rural areas. However, people with these wealth will not reduce prices or give them away because farmers do not need these things
In today's market economy, diamonds, gold and other items can actually be equivalent to money. Although they are not used for daily purposes, they can stabilize money. Therefore, they have "expensive prices" - a phenomenon in our current economy and society. If human society develops to a higher stage, material and civilization are quite sufficient to meet human needs, then, These expensive things may lose a lot of value they have now

Marginal utility explains diamonds and water Diamonds are very useful and expensive, but water indispensable to life is very cheap. Please explain it with the concept of marginal utility

Water is important to life, so it should have high value. On the other hand, diamond is not important to life, so people should think its value is lower than water. However, even if water can provide more utility, it is much cheaper than diamond. Diamond is really far less useful to people than water, so people from

Diamonds are very useful and expensive, but water essential to life is very cheap. Please explain this phenomenon with the theory of marginal utility

Have you learned the principles of economics
Water is more important to people than diamonds, because the objective utility of water is greater than diamonds. "Rare things are more expensive". According to the law of marginal utility, the utility and consumption change inversely and determine the demand price. The water consumption is much larger than diamonds, the marginal utility demand price of water is small, and the marginal utility demand price of diamonds is large, but the utility and consumption change inversely, so diamonds are of little use and high value, The water essential to life is very cheap

Explain the relationship between total utility and marginal utility? Why are diamonds more expensive than water?

Relationship: with the increase of consumption, as long as the marginal utility is positive, the total utility also increases. However, when the marginal utility decreases to zero, the total utility stops increasing. When the number of consumer goods increases, the total utility will increase at a slower and slower rate. This is because, with the increase of the number of consumer goods, the marginal effect

What is marginal utility