📚 Sources of the Money Supply | 货币供应的来源
Understanding where money comes from is fundamental to grasping how monetary policy operates and how the financial system fuels economic activity. The money supply is not simply the stock of printed notes and coins; the majority consists of digital deposits created by commercial banks through lending. This article systematically examines the key sources of the money supply—from the central bank’s issuance of the monetary base to the deposit-creation process of the banking sector, government borrowing, and modern tools like quantitative easing. Each source is explained in a clear pair of English and Chinese paragraphs, following the Cambridge International A-Level Economics framework.
理解货币从何而来是掌握货币政策运行及金融体系如何推动经济活动的基础。货币供应不仅仅是印制的纸币和硬币存量，绝大部分是由商业银行通过贷款创造的数字存款。本文系统地梳理了货币供应的主要来源——从中央银行投放基础货币到银行体系的存款创造过程、政府借款以及量化宽松等现代工具。每一要点均以清晰的中英文段落对照呈现，紧扣剑桥国际A-Level经济学框架。
1. Defining the Money Supply | 货币供应的定义
The money supply refers to the total stock of monetary assets available in an economy at a specific time. Narrow measures, such as M1, include currency in circulation (notes and coins held by the public) and sight deposits (chequing accounts). Broader definitions, like M2 or M3, add savings deposits, time deposits, and other near-money assets. In the UK, the Bank of England uses M0 for the monetary base, M2 for retail deposits, and M4 for the broad money supply held by the private sector. Economists and central banks monitor these aggregates to gauge spending capacity and inflationary pressures.
货币供应是指一个经济体中在某一特定时点可用的货币性资产总量。狭义衡量指标如M1包括流通中的现金（公众持有的纸币和硬币）和活期存款（支票账户）。广义口径如M2或M3则加入了储蓄存款、定期存款及其他准货币资产。在英国，英格兰银行使用M0代表基础货币、M2表示零售存款、M4代表私人部门持有的广义货币供给。经济学家和央行通过监测这些总量指标来判断支出能力和通胀压力。
2. The Monetary Base: Foundation of the Money Supply | 基础货币：货币供应的根基
The monetary base, also called high-powered money, is the ultimate source of the entire money supply. It comprises two components: cash in circulation (notes and coins) and commercial banks’ reserves held at the central bank. Only the central bank can create or destroy monetary base, making it the anchor for broader monetary aggregates. An increase in the monetary base supplies the raw material that the banking system can multiply into a much larger sum of deposit money.
基础货币又称高能货币，是整个货币供应的最终源头。它由两部分构成：流通中的现金（纸币和硬币）以及商业银行在中央银行的准备金。只有央行能够创造或消灭基础货币，这使其成为广义货币总量的锚定基础。基础货币的增加为银行体系提供了“原材料”，银行体系可以将其成倍放大为数量远超初始的存款货币。
3. Central Bank Open Market Operations | 中央银行的公开市场操作
Open market operations (OMOs) are the primary conventional tool for altering the monetary base. When a central bank purchases government bonds from commercial banks or financial institutions, it credits the sellers’ reserve accounts with newly created electronic money. This directly increases the monetary base and injects liquidity into the banking system. Conversely, selling bonds withdraws reserves, shrinking the base. OMOs are used routinely to steer short-term interest rates toward the policy target.
公开市场操作是调整基础货币的主要常规工具。当央行向商业银行或金融机构购买政府债券时，会用新创造的电子货币贷记卖方准备金账户。这直接增加了基础货币，并向银行体系注入流动性。反之，卖出债券则会收回准备金，缩减基础货币规模。公开市场操作被日常用于引导短期利率向政策目标靠拢。
4. Government Borrowing from the Central Bank | 政府向中央银行借款
Governments can also be a direct source of money supply expansion when they borrow from the central bank. In some countries, the central bank may directly finance government deficits by purchasing newly issued government securities, a practice known as ‘monetising the debt’. This process swells the monetary base as the government spends the borrowed funds, which end up as deposits in the banking system. Such borrowing is often restricted or prohibited by law in developed economies to prevent excessive money creation and inflation.
政府向中央银行借款也能直接带来货币供应的扩张。在一些国家，央行可以通过购买新发行的政府证券来直接为财政赤字融资，这一做法被称为“债务货币化”。随着政府支出借入资金，这些资金最终以银行存款形式进入银行体系，从而导致基础货币膨胀。发达经济体通常通过法律限制或禁止此类借款，以防止过度的货币创造和通货膨胀。
5. Bank Lending and Deposit Creation | 银行贷款与存款创造
The bulk of the money supply, particularly broad money, originates from commercial bank lending. When a bank grants a loan, it simultaneously creates a deposit in the borrower’s account. This newly created deposit counts as money, even though no physical cash changes hands. Thus, credit creation by private banks multiplies the initial monetary base into a far larger stock of bank money. This process rests on the fact that deposits are not fully backed by reserves under fractional-reserve banking.
货币供应——尤其是广义货币——的绝大部分源自商业银行的贷款活动。当银行发放一笔贷款时，它同时在借款人账户上创造一笔存款。这笔新生成的存款虽然不涉及实物现金转移，却计为货币。因此，私人银行的信用创造将初始的基础货币放大了数倍，形成规模远超其上的银行存款。这一过程的前提是部分准备金制度下存款并非全部由准备金支撑。
6. The Money Multiplier Process | 货币乘数过程
The money multiplier illustrates the mathematical relationship between the monetary base and the total money supply. If banks are required to hold a fraction of deposits as reserves (reserve ratio ‘r’), any injection of reserves can theoretically be multiplied up to a limit. The simple deposit multiplier is given by:
Change in Money Supply = (1 ÷ r) × Change in Monetary Base
For instance, with a 10% reserve requirement, an initial £100 increase in reserves can ultimately support an additional £1000 of deposits, assuming banks lend out all excess reserves and the public redeposits any cash received.
货币乘数揭示了基础货币与货币供应总量之间的数理关系。如果银行必须将存款的一定比例作为准备金（准备金率 ‘r’），那么任何准备金注入理论上都有可能被放大到一个极限。简单存款乘数公式如下：
货币供应变动 = (1 ÷ r) × 基础货币变动
例如，准备金率为10%时，初始的100英镑准备金增加最终可以支撑额外的1000英镑存款，前提是银行将所有超额准备金贷出且公众将收到的现金全部重新存入银行。
7. The Role of Commercial Banks’ Reserves | 商业银行准备金的作用
Reserves are settlements and liquidity buffers that enable banks to meet withdrawals and interbank payments. Central banks typically mandate reserve requirements, but even without formal requirements, banks voluntarily hold reserves. The fraction of deposits held as reserves determines the banking system’s capacity to create money. If banks choose to hold excess reserves—for example, during periods of uncertainty—the money multiplier falls, and the same monetary base generates a smaller broad money supply. Thus, banks’ reserve preferences are a critical link between the base and actual money creation.
准备金是用于结算和流动性缓冲的资金，使银行能够满足提现需求和同业支付。中央银行通常会设定法定准备金要求，但即便没有正式要求，银行也会自愿持有准备金。存款中作为准备金持有的比例决定了银行体系创造货币的能力。如果银行选择持有超额准备金——例如在不确定性较高的时期——货币乘数就会下降，同等的基础货币将产生更小的广义货币供应。因此，银行的准备金偏好是连接基础货币与实际货币创造的关键一环。
8. Foreign Exchange Operations and Money Supply | 外汇操作与货币供应
Central banks may intervene in foreign exchange markets, and these actions directly affect the domestic money supply. When a central bank purchases foreign currency, it pays with domestic currency, thereby increasing the monetary base. Conversely, selling foreign reserves absorbs domestic currency. In a fixed or managed exchange-rate regime, sustained intervention to prevent appreciation can lead to rapid domestic money-supply growth. To counteract this, central banks sometimes engage in sterilisation—selling domestic bonds to re‑absorb the excess liquidity created by FX purchases.
中央银行可能在外汇市场进行干预，这些操作会直接影响国内货币供应。当央行购买外币时，它使用本币进行支付，从而增加基础货币。反之，卖出外汇储备则会收回本币。在固定或管理浮动汇率制度下，为抑制本币升值而持续干预，可能导致国内货币供应快速增长。为抵消这一影响，央行有时会进行冲销操作——卖出国内债券重新吸收由外汇买入创造的超额流动性。
9. Quantitative Easing as a Modern Source | 量化宽松作为现代来源
When policy rates approach zero and conventional open market operations lose traction, central banks may resort to quantitative easing (QE). QE involves large-scale purchases of government bonds (and sometimes corporate bonds) from the non-bank private sector, such as pension funds and insurance companies. These purchases credit the sellers’ bank accounts, instantly creating broad money and injecting vast reserves. The aim is to lower long-term interest rates, stimulate spending, and raise asset prices. QE has been a major source of money supply growth in the UK, US, and Eurozone since the global financial crisis.
当政策利率接近零且常规公开市场操作失效时，央行可能诉诸量化宽松。量化宽松是指从非银行私人部门（如养老基金和保险公司）大规模购买政府债券（有时也包括公司债券）。这些购买会贷记卖方的银行账户，瞬间创造广义货币并注入巨额准备金。其目的是降低长期利率、刺激支出并推高资产价格。自全球金融危机以来，量化宽松已成为英国、美国和欧元区货币供应增长的重要来源。
10. Endogenous vs Exogenous Money Supply | 内生与外生货币供应理论
The debate on the origins of money supply divides into two broad schools. The exogenous view, associated with monetarism, holds that the central bank controls the monetary base and, through a stable multiplier, determines the total money supply. The endogenous view, advanced by post-Keynesian economists, argues that money supply is determined by the demand for bank loans: banks create deposits in response to creditworthy borrowers, and the central bank passively accommodates the need for reserves. In reality, central banks influence but do not mechanically control broad money, and the lending intentions of commercial banks are a prime source.
关于货币供应来源的争论分为两大流派。与货币主义相连的外生供给观点认为，中央银行控制基础货币，通过稳定的乘数决定货币供应总量。后凯恩斯主义经济学家倡导的内生供给观点则认为，货币供应由银行贷款需求决定：银行根据有信誉的借款人需求创造存款，央行只是被动地满足准备金需求。现实中，中央银行能够影响但无法机械地控制广义货币，商业银行的放贷意愿才是货币创造的首要来源。
11. Factors Limiting Money Creation | 限制货币创造的因素
Several real‑world constraints prevent banks from creating unlimited deposits. Capital requirements force banks to hold sufficient equity against risk‑weighted assets, limiting their balance‑sheet expansion. The willingness of consumers and firms to borrow can fall sharply during recessions, reducing loan demand. Banks may tighten credit standards amid rising non‑performing loans. Additionally, prudential liquidity ratios and the central bank’s interest‑rate decisions influence the cost of funding. All these factors mean that the multiplier is neither constant nor mechanically deterministic, and money supply growth fluctuates accordingly.
现实中的若干约束阻止了银行无限制地创造存款。资本充足率要求银行针对风险加权资产持有足够的自有资本，限制了资产负债表膨胀。消费者和企业的借款意愿在经济衰退期间可能急剧下降，降低贷款需求。银行在不良贷款上升时可能收紧信贷标准。此外，审慎流动性比率和央行的利率决策也影响融资成本。这些因素意味着货币乘数并非恒定不变或机械决定，货币供应增长会随之波动。
12. Summary of Sources | 来源总结
The money supply emerges from the interaction between the central bank, commercial banking system, government, and foreign sector. The table below summarises the primary channels:
货币供应产生于中央银行、商业银行体系、政府和对外部门之间的相互作用。下表汇总了主要渠道：
| Source / 来源 | Mechanism / 机制 | Effect on Money Supply / 对货币供应的影响 |
|---|---|---|
| Central bank open market purchases / 央行公开市场购买 | Buying government bonds from banks, injecting reserves. | Increases monetary base; enabling multiplier expansion. |
| Government deficit monetisation / 政府赤字货币化 | Central bank directly finances government spending. | Boosts monetary base; adds deposits when spent. |
| Commercial bank lending / 商业银行贷款 | Loans create deposits; credit multiplication. | Main source of broad money growth. |
| FX intervention / 外汇干预 | Buying foreign currency with domestic base money. | Raises monetary base; can be sterilised. |
| Quantitative easing / 量化宽松 | Large-scale asset purchases from non‑banks. | Directly expands broad money and reserves. |
A‑Level candidates should be able to recognise that the money supply is not a fixed pile of cash but a dynamic quantity shaped by policy decisions, bank behaviour, and the demand for credit.
A‑Level考生应能认识到，货币供应并非一堆固定不变的现金，而是由政策决策、银行行为和信贷需求共同塑造的动态量。
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