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Answer:
Nathan's contention is wrong.
Explanation:
Storage of money at home involves the opportunity cost of losing out on income that would've been generated had the same money been invested elsewhere or deposited with a bank.
Secondly, money stored at home is vulnerable to theft and other forms of risks.
Thirdly, stored money at home does not contribute to any economic benefit since such money is out of circular flow of money in the economy. So it yields no return.
Thus, Nathan's contention of stored money at home being costless is wrong.