These purchases would need Treasury support, since this tactic is in effect a fiscal policy, not a monetary policy. And, by involving the Treasury, the purchase of risky assets could be financed by issuing debt, rather than by printing more money, thereby attenuating inflationary fears.
央行买入风险资产的量化宽松政策可以防止价格波动、重塑金融财富价值。政府的买入行为需要财政部的支持，因为这一策略本质上是财政政策而非货币政策。此外，若能让财政部介入，买入风险资产的资金就可以通过发行债券融得，而不必印刷新钞进而引发通胀担忧。