Answer:
C. are unchanged; is unchanged
Explanation:
When the US purchases oil from Saudi Arabia its imports increases and hence Net export falls. However, when Saudi Arabia purchases transportation service US export rises by the equivalent amount. Hence the Net exports are unchanged.
Since there are no capital flow, it is also unchanged.
enforceable, legality
For a contract to be enforceable it must meet the requirement of legality and both the subject matter and the performance of the contract must be legal
An agreement to be a contract must establish a duty that is enforceable by law by the provisions of contract laws. Any arrangement that does not provide for enforceability—that is, one in which the parties cannot seek redress in court for breach of the agreement s not a contract. To create legality in a relationship, the contract must have intent. It happens when the parties are aware that each of them is responsible for the contract's failure if they fail to keep their part of the contract.
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Variable cost refers to the costs of production that fluctuate depending on the number of units produced.
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Explanation:</u></h3>
The cost of any product that changes based on the quantity of goods that are produced. The volume that is produced decides the fluctuations in the variable cost. Fixed cost is the cost that will not change based on the number of units of the goods that is produced. Rent of a building can be considered as a fixed cost.
Example for variable cost may be raw materials cost, packaging cost,etc. Variable cost can be calculated by adding up the cost of labor and raw materials that are used in the production of one unit of a good. The total variable cost can be calculated by multiplying variable cost per unit with the number of units produced.
