Final answer:
The economic term in this situation is Exchange Rate, which made the kids feel better about their money because they could exchange their dollars for more Dirham.
Step-by-step explanation:
The economic term that this situation is an example of is Exchange Rate. An exchange rate is the value of one currency in terms of another currency. In this case, the exchange rate of $1 to 3.75 Dirham made the kids feel better about their money because it indicates that their dollars can be converted into more Dirham, making the Dirham seem less expensive.