Cecilia’s knowledge of economics help her make a savvy commodity purchase because she knew that the purchase of diamonds will satisfy wants and needs.
When the price of diamonds decrease, the cost of making a diamond necklace would decline and the price of a diamond necklace would decline.
Also, as a result of the opening of the new diamond mine, the supply of diamond would increase. This would reduce the cost of making a diamond necklace.
For more information about the change in demand, please check: https://brainly.com/question/25871620