Answer: a). Spain
b). none
c). 2.4
Explanation: a). Absolute advantage occurs when a country produces more of a good than the other country. In this case, Spain produces 50 units of Tractors while, Bolivia produces only 30 units of Tractors. Thus, Since Spain is producing more it has an absolute advantage in Tractors.
b). Both the countries are producing equal units of Cotton. Thus, we can say that none of them has an absolute advantage in cotton production.
c. Opportunity cost is the cost of the lost alternative. When Spain produces Tractors it is sacrificing production of Cotton. So, opportunity cost on 1 unit of Tractor will be,

Thus, 2.4 units of cotton which is given up is the opportunity cost of Spain for producing 1 unit of Tractor.
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Answer:
To insure bank deposits.
Explanation:
After the great depression the FDIC was created to insurance bank deposits and to give stability and security to the financial system
Answer:
d. maria would not have to pay anything.
Explanation:
In this scenario Maria did not form a contract with the man to cut her lawn and had not even met him before. So there is no contract formed voluntarily, neither is it an implied contract.
Maria was enriched in this process because she will benefit from the cutting of the lawn. She was however not unjustly enriched because the man was not unduly influenced to carry out the task.
Maria can however pay the man after the fact at her discretion.