Central banks are often presented as technical institutions tasked with ensuring monetary stability and containing inflation. This definition remains accurate, but it is no longer sufficient to describe their role in contemporary economies, as their decisions now produce effects that extend far beyond monetary policy alone. When they change policy rates, inject liquidity into the financial system, or intervene in the markets, they directly influence the cost of credit, government financing conditions, housing markets, business investment, and, indirectly, employment.

This rise in power accelerated particularly after the 2008 global financial crisis, a period during which central banks gradually ceased to be perceived as mere guardians of price stability. Faced with the collapse of financial markets and the risks of a deep recession, they began to intervene much more directly to support the economy, mobilizing instruments whose scale had rarely been seen before.

The figures allow us to measure this transformation precisely. Between 2008 and 2022, the balance sheet of the US Federal Reserve grew from approximately $900 billion to over $8 trillion after several rounds of massive asset purchases. At the same time, that of the European Central Bank (ECB) exceeded €8.5 trillion following the various programs implemented in the wake of the financial crisis and then during the pandemic. These amounts give an idea of the scale reached by institutions that, just fifteen years ago, played a much more limited role in directly supporting economic activity.

Behind these very high figures lies a mechanism that directly impacts daily economic life. When a central bank lowers its interest rates, the price of money gradually decreases throughout the economy, which generally facilitates access to mortgage loans, reduces the cost of financing for businesses, and allows governments to borrow under more favorable conditions. Conversely, when interest rates rise, the effects also spread throughout the financial system, but in the opposite direction.

Real estate markets offer a particularly striking illustration because they often react quickly to monetary conditions. In the United States, the years of extremely low interest rates following the 2008 crisis contributed to a significant rise in prices in several major cities. Between early 2020 and mid-2022, the S&P CoreLogic Case-Shiller index rose by approximately 40%, driven in particular by exceptionally favorable financial conditions.

But the influence of central banks doesn't stop at mortgage lending or bank loans, because financial markets also adjust their behavior to every signal sent by these institutions. A simple announcement about future interest rate movements can alter capital flows, cause fluctuations in bond markets, or trigger massive reallocations of investments within hours.

The Covid-19 crisis made this influence even more visible, as major central banks injected trillions of dollars into financial markets to prevent a credit freeze and a deeper economic collapse. Governments were then able to finance exceptionally large support packages thanks to particularly favorable monetary conditions.

This development has gradually blurred the line between monetary policy and broader economic policy, since a decision on key interest rates can now modify the interest burden of public debt, influence the investment capacity of companies or affect access to housing for millions of households.

The impact of the BCEAO in the WAEMU area

Within the WAEMU region, this reality also exists, albeit in a different form. The BCEAO sets key interest rates for eight countries representing over 140 million inhabitants, giving it direct influence over bank refinancing conditions, a portion of the cost of credit, and the financing capacity of member states.

The inflationary pressures observed between 2022 and 2023 provide a concrete illustration of this role. When the BCEAO gradually raised its rates to contain price pressures, this decision pursued a classic monetary objective, but its consequences went far beyond this framework, since a tightening of financial conditions can simultaneously slow inflation, increase the cost of credit for businesses and raise the public financing burden.

The question, therefore, is not whether central banks engage in political action in the partisan sense of the term, but rather to understand the extent to which their economic decisions produce effects that concern society as a whole. When an institution can influence credit, direct a portion of investments, affect housing markets, and indirectly impact employment, it wields considerable economic power, even without relying on traditional electoral mechanisms.