Final answer:
The most sound financial decision is to buy a new pair of blue jeans when your old pair no longer fits.
Step-by-step explanation:
The most likely sound financial decision for buying a new pair of blue jeans is when your old pair no longer fits. This is because a new pair of jeans will serve a functional purpose, providing you with proper clothing that fits well. It is important to make practical purchasing decisions based on need rather than desires such as having extra money, admiring a stylish display, or trying to impress others.
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