When it comes to gold, the media often talks about 'London Gold'. In short, it is 400 ounces of 99.5% pure gold bricks stored in the underground vaults of the City of London.
International trade and non-trade transactions that occur as a result of claims and debts are received and paid in currency and settled under certain forms and conditions, thus giving rise to the international settlement business.
In a broad sense, any risk-taking behavior for profit can be called speculation; in a narrower sense, speculation refers to risky investment behavior that takes advantage of fluctuations in the price of commodities or financial assets in the market.
Every time a financial crisis breaks out, there is a depression in all industries, a large number of workers are laid off and people's livelihoods wither away.