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Banking theory, as a distinct subfield within monetary economics, is structured by competing paradigms regarding the fundamental nature, function, and stability of banks. Its classical foundations were dominated by the Real Bills Doctrine, which posited that banks should only issue money (or credit) against short-term, self-liquidating commercial loans to productive enterprises, thereby ensuring money’s value was tied to real output and preventing inflation. This view, which saw banking as essentially passive and responsive to the needs of trade, was challenged by the Fractional Reserve Banking paradigm emerging from neoclassical analysis. This framework analytically treated banks as profit-maximizing deposit-taking intermediaries that multiply a given base of central bank money through a stable reserve ratio, formalizing the money multiplier process and centering bank solvency and reserve management.
A decisive shift occurred with the rise of the Financial Intermediation Theory. This school reconceptualized banks not as mere money multipliers but as unique institutions that resolve informational asymmetries and transaction costs in credit markets. By specializing in screening borrowers, monitoring loans, and providing liquidity transformation, banks were seen as essential delegated monitors and creators of inside money, fundamentally altering welfare and stability analyses. This information-theoretic approach became the core of the modern microeconomics of banking.
Concurrently, a rival macro-oriented tradition developed. The Endogenous Money approach, principally advanced within Post-Keynesian Economics, inverted the causality of the fractional reserve model. It argues that banks create deposits ex nihilo by extending loans based on creditworthy demand, with reserves supplied accommodatively by the central bank. This framework treats the money supply as credit-driven and endogenous, making bank liquidity preference and financing behavior central to macroeconomic dynamics.
The field’s contemporary landscape is defined by the synthesis and tension between these core families. The dominant Information-Theoretic Approach extends financial intermediation theory to explain bank runs, capital regulation, and the transmission of monetary policy through bank balance sheets. It contends with the Endogenous Money school over the exogeneity of credit and the role of leverage. A distinct, policy-oriented rival is the Free Banking School, which applies neoclassical competitive equilibrium analysis to argue that banking requires no special state monopoly or central bank lender of last resort, advocating for deregulated, note-issuing private banks. These paradigms provide the foundational theoretical commitments for analyzing bank behavior, systemic risk, and monetary architecture.