The concept her is "the real cost of something is what you must give up to get it"
<u>Explanation:</u>
As we come across trade-offs it is a necessary to make decisions on the next best alternatives which is the principle of opportunity cost.
Opportunity cost is the benefits and advantages that a business entity or an individual loses on choosing one alternative decision over the other. It is calculated with the help of the following formulas,

Or,

In economical terms, choices are measured in terms of opportunity costs.
with common resources, the equilibrium quantity can be individually rational because the consumer of the common resource experiences individual benefits from use of the common resources
<h3>What is
equilibrium?</h3>
Chemical equilibrium is the state in which both the reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
The only thing that can change an equilibrium constant is temperature. If the pressure is changed, the position of equilibrium can be altered. The position of equilibrium moves in such a way that it tends to undo the change that you have made
When a reaction and its reverse reaction proceed at the same rate, this is referred to as chemical equilibrium. Both forward and reverse reactions occur as a system approaches equilibrium.
To know more about equilibrium follow the link:
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Answer:
C. They value those goods at least as much as the price charged.
Explanation:
When buyers buy goods in a market they are doing so because they value those goods at least as much as the price charged and obviously prefer the particular good (product) to the other which is being offered by the seller.
This ultimately implies that, when anyone buys a new product, it is simply because they feel the product is going to give them value for the price or amount of money being paid.