Don’t you worry. I know very familiar with what you mean.

I’m not suggesting that Americas tax rules haven’t been utterly compromised by billionaires. I’m saying that, in other countries, that’s tax evasion.

They would have to sell to realise the loss and declare it to claim the tax relief. The other alternative is that billionaires never pay tax on their capital gains and that would be a bat shit crazy way to run an economy.