Policy interest rates are near zero (and sometimes below it) in most advanced economies, and the monetary base (money created by central banks in the form of cash and liquid commercial-bank reserves) has soared – doubling, tripling, and, in the United States, quadrupling relative to the pre-crisis period. This has kept short- and long-term interest rates low (and even negative in some cases, such as Europe and Japan), reduced the volatility of bond markets, and lifted many asset prices (including equities, real estate, and fixed-income private- and public-sector bonds).
大部分发达经济体的政策利率目前处于近零水平（有时甚至低于零），货币基础（中央银行创造的、以现金和高流动性商业银行准备金为形式的货币）激增——或者两倍，或者三倍，美国更是达到了相对于危机前时期的四倍。这让短期和长期利率保持低位（有时甚至出现了负利率，比如欧洲和日本），降低了债券市场波动，也让许多资产价格上涨（包括股票、房地产、固定收益私人和公共部门债券）。