The reason why water and gold may become equal is most likely going to be due to their usefulness.
This is from what is known as the paradox of value. What this means is that water tends to have more usefulness to humans, but gold is known to have more value in terms of amount in the market.
This shows what is known as the subjective value. The equality can be seen in the value in use of water and the market value of gold in terms of its cost.
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