Final answer:
The Euro's costs and the impact of losing control over its value are important topics in the field of Economics.
Step-by-step explanation:
The subject of the question is Economics. The question mentions the costs of the Euro and the impact of losing control over its value. One major reason for the fall in the Euro's value is the inflows and outflows of foreign capital. When there are sudden outflows of capital, the demand for the Euro decreases, causing its value to decline.