When marginal utility decreases, total utility grows at a decreasing pace, according to the law of declining marginal utility. The slope of the total utility curve is determined by the marginal utility, which is the rate of change in total utility. Therefore, as marginal utility declines, the overall effect on total utility must increase.
In response to your inquiry, the law of decreasing marginal utility holds that when more units of a specific product are consumed, the consumer derives less utility from them. This explains the demand curve's decreasing slope. As consumers increase their consumption of a product, their demand for more and more expensive units decreases.
This lesson will help you understand how declining marginal utility affects demand. First, it is important to understand what this phrase means. Marginal utility refers to the value of another unit of a product after one more unit has been purchased. For example, if I own two pairs of pants and my current pair costs $100, then my marginal utility for another pair would be $100. If I bought the most expensive pair available, my marginal utility for another pair would be nothing because I already have used up my budget for clothes.
Now that we know what marginal utility is, we can discuss its effect on demand. When we buy more and more expensive units of a product, our need for further units decreases because we obtained all the value we could out of the first units we bought. This explanation is similar to the one given by Keynes for why demand tends toward equilibrium: "People want to get as much utility as they can out of each additional unit of goods they consume."
Thus, declining marginal utility causes demand to fall as consumption increases.
It should be highlighted that the marginal utility, not the overall utility, decreases when the consumption of an item increases. According to the law of declining marginal utility, overall utility grows but at a decreasing pace. Therefore, the more one consumes an item, the less useful it becomes until it is consumed up.
In economics, the law of diminishing marginal utility (DMU) states that the marginal utility of additional units of a good or service declines as the amount purchased increases. The law can be illustrated by considering the case of money. If $10,000 is placed in the bank and a certain interest rate is used, then at first the $10,000 will provide a great deal of comfort because even a small increase in our income will result in a large increase in our wealth. However, as we enter into higher-order amounts, each additional dollar will have less and less effect on our satisfaction. That is, the marginal utility of more money diminishes.
This law applies to goods as well as services. For example, if enough television sets are bought, even the addition of another unit will not produce as much enjoyment as it did before because all available sets will already be owned. The law also applies to physical assets such as land or buildings. For example, if a house contains only one room, then adding another room will not increase its value that much.