We often say that "credit marketization" refers to the issuance of loans in the form of securities, and the loan interest as the income of securities allows this product to enter the market. This is the same thing as MBS.

Buy 40 billion MBS: Securities are issued by banks and open to all investors. Of course, the government can also buy them. Banks selling MBS can solve the liquidity problem of banks. In other words, QE3 is a variant of quantitative easing.

Maybe you don't know what MBS in QE3 means, but you should know the "quantitative easing policy", because the increase in the supply of US dollars will directly lead to the depreciation of the US dollar, and the US dollar is directly linked to gold, so the corresponding precious metals will appreciate relative to the US dollar.