Because the life scale of things is closely related to their internal characteristics, when we measure the life scale of all things, there will be an estimated life length, not an absolute time range. Fresh fruit will have a shelf life of several days, but we can keep the fruit for several days, which means that its value can be stored as a useful part of his life, so that fresh fruit will have a rough life scale. On the contrary, although the roof can be preserved for decades, its value will actually disappear bit by bit with the passage of time. Therefore, when the roof reaches its service life, we can't keep its value for future use.

It is precisely because of the relationship between the life scale of resources and the value storage that decreases with time that we use the term "storability" to study the consumption scale of things.

The scale of consumption is related to the degree of control of users, that is, the proportion of users extracting useful value. The higher the user's ability to extract extended value, the larger the scale of resource consumption. Users have the ability to extract useful value from raw materials.

Very cautious. In this way, the rate of value extraction may also be interrupted or fluctuated abnormally, because users speed up or slow down the rate of value extraction. Usage-based data is used to measure the opportunity cost and rough consumption scale of resources. On the contrary, users can't deal with gradually weathered stone carvings in an open environment, which means that the value extraction rate is sometimes constant, so this resource has a stable consumption scale. Measurement for the purpose of use or consumption cannot effectively measure the opportunity cost of consuming resources with stable scale.

Because the scale of resource consumption is controlled by users, we often use controllable systems to explain it clearly. In addition, we notice that the definitions of life scale and consumption scale involve normal use and expected use. When we use purposes other than resources (which we call normal and ordinary), its scale may change. The resulting opportunity cost estimate may also change, because the opportunity cost depends on the resources used in the environment.

Alas, I finally finished translating. I am preparing for the IELTS test. I am practicing, because I graduated from English major. Please forgive me if there is any terminology error, hehe-)