Answer:
The correct answer that fills the gap is: must have been produced.
Step-by-step explanation:
Capital is one of the four factors of production along with land, labor and technology. It includes all durable goods that are used to manufacture other goods or services. It has two main criteria that allow its recognition, which are:
- The resource must have been produced.
- The resource can be used to produce other goods and services.
According to the above, any of the three factors described can be used to create capital, because within the chain monetary resources are perceived that grant a certain return to those who alienate the good or produce a service.