Thelma grows carrots in her garden, but she needs a winter coat. John has an extra coat he does not need but would like to bake a carrot cake. The two find each other and make an exchange. This situation is called the

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The situation described is an example of the double coincidence of wants, where two parties each have something the other wants and are able to exchange goods or services without the use of money. Thelma wants a winter coat and John wants a carrot cake, making it a coincidence of wants that allows for the exchange to take place.

Thelma Grows Carrots in Her Garden, but She Needs a Winter