Ce que les dépôts à la banque centrale révèlent du système financier moderne
When an individual deposits 1 million FCFA into their bank account, they often assume that this money will be immediately loaned to a company or another client. The reality is more complex. A portion of the liquidity held by banks is never converted into credit. It remains deposited with the central bank or held as highly liquid assets. This phenomenon, which may seem paradoxical in a sector whose very purpose is to finance the economy, actually helps to explain several fundamental mechanisms of money creation and financial stability.
The idea that a bank automatically lends out everything it receives on deposit is a simplistic representation rather than a true reflection of how the modern banking system works. When a financial institution grants credit, its decision depends primarily on the borrower's creditworthiness, the level of risk associated with the transaction, its own financial situation, and the regulatory constraints to which it is subject.
Even when a bank has ample liquidity, it doesn't necessarily lend more. If it considers the risks too high or the economic outlook uncertain, it may prefer to retain some of its resources rather than finance projects deemed too risky.
Reserve requirements are one explanation. In the WAEMU, as in most monetary zones, the BCEAO requires banks to hold a portion of their resources as reserves. These funds are deposited with the central bank and cannot be freely used to grant loans.
This tool allows the central bank to influence the liquidity of the banking system. When monetary authorities wish to limit credit expansion, they can raise certain prudential requirements or use other monetary policy instruments to reduce the amount of resources immediately available to banks.
However, mandatory reserves only explain part of the phenomenon. Financial institutions also hold so-called excess reserves, meaning amounts exceeding what is strictly required by regulations. This behavior is particularly noticeable during periods of economic uncertainty.
The 2008 global financial crisis profoundly changed how banks manage their liquidity. Before the crisis, many institutions sought to maximize the use of their resources to improve profitability. The subsequent collapse of several international institutions demonstrated that a lack of liquidity could lead to extremely rapid difficulties, even for seemingly sound banks.
Since then, regulatory requirements have been significantly strengthened. The Basel III agreements, being progressively implemented in many parts of the world, require banks to maintain sufficient liquidity reserves to withstand financial stress scenarios. The aim is to prevent institutions from becoming unable to cope with massive deposit withdrawals or a crisis of confidence.
This logic is particularly important in the WAEMU, where the banking sector plays a major role in financing the economy. According to BCEAO data, loans granted to the economy amounted to more than 23 trillion CFA francs at the end of 2024, while deposits collected exceeded 30 trillion CFA francs. These figures demonstrate the scale of the financial flows involved and the importance of prudent liquidity management.
Banks also engage in ongoing financial arbitrage. Lending to a company can generate higher returns, but carries a risk of default. Holding some liquidity with the central bank or investing in government bonds may offer lower returns, but with a much lower level of risk.
This pattern becomes particularly apparent when interest rates rise. In several regions of the world, central bank rate hikes between 2022 and 2024 made certain risk-free investments more attractive. Under these conditions, financial institutions may have less incentive to rapidly expand their loan portfolios.
Borrower behavior also plays a significant role. A bank can only grant credit if there is demand. Even with abundant resources, it cannot artificially create profitable projects or solvent businesses. When economic activity slows, households and businesses sometimes tend to postpone certain investments or limit their borrowing, which naturally reduces the demand for credit.
This reality helps explain why liquidity injections decided by a central bank do not always translate into an immediate increase in lending to the economy. After the 2020 health crisis, many central banks provided considerable amounts of liquidity to the financial system. A portion of these resources remained within the banking sector instead of being fully converted into new loans.
Money creation itself largely depends on these mechanisms. Contrary to popular belief, banks do not create money simply because they hold deposits. They primarily create money when they grant loans. When a loan is granted to a business or household, a new deposit simultaneously appears in the banking system. This process is then governed by capital, liquidity, and supervisory constraints imposed by regulators.
Recent developments in government financing within the WAEMU add another dimension to this analysis. Banks hold a significant share of the public securities issued by the region's governments. According to statistics from UMOA-Titres and the BCEAO, banks are among the main investors in the regional public debt market. A portion of available liquidity can therefore be directed towards the purchase of Treasury bills or bonds rather than direct financing of businesses.
This situation regularly fuels debate among economists. Some believe that significant government financing can reduce the resources available to the private sector. Others consider that government bonds play a useful role in managing bank liquidity and in the overall functioning of the financial system.
Ultimately, when a bank leaves some of its liquidity with the central bank rather than lending it out, it doesn't necessarily indicate a problem. This decision often results from a balance between prudence, regulation, risk management, market opportunities, and economic outlook. Understanding these trade-offs helps us better grasp why credit depends not only on the amount of money available in banks, but also on confidence, regulation, and the economic conditions in which they operate.
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