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Wheat may spoil if stored for a long time.
Money is portable and durable compared to wheat.
₹300 − ₹40 − ₹80 = ₹180.
Total spent = ₹320. Remaining = ₹180.
Rice exchanged = 27 kg. Remaining = 13 kg.
The farmer's and carpenter's wants do not match directly.
Without a common measure, comparing the value of different goods becomes difficult.
Wheat can spoil over time, creating the problem of durability.
Money is accepted by everyone, so people need not find someone with matching wants.
Total expenditure = ₹600. Savings = ₹600.
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