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It’s because they’re using European mathematics. You wouldn’t understand if you’re American.

In reality the article is attempting to account for a capital gain pnl accounting for taxes.

I'm not sure the central bank is paying capital gains taxes?

price of gold dropped from $5500 to $4600 in the last few weeks then came back. all is possible

Then they didn't make money as a result of the price rising, which is what the original commenter and article claimed.

Usually that's how you want your selling and buying combos to be...