Saturday, July 20, 2019

The before and after the risk weighted bank capital adequacy ratio (RWCR)

The risk weighted bank capital requirements were introduced in 1988 by means of the Basel Accord, Basel I, and were much further developed in 2004, with Basel II. RWCR survives in Basel III.

Before RWCR banks, for their return on equity, leaned on savvy bank loan officers to obtain the highest risk adjusted net margins. A net margin of 1.5% when leveraged 10 times on their equity, would produce a 15% ROE. All wanting access to bank credit, whether perceived as safe or risky, competed equally with their risk adjusted net margin offers.

After the introduction of RWCR though banks, for their return on equity, still leaned somewhat on bank loan officers obtaining the highest ROE depended more on equity minimizing financial engineers. A risk adjusted net margin of 1%, when leveraged 20 times on equity, produces a 20% ROE. The risk adjusted net margin offers of those perceived or decreed as safe, which could be leveraged many times more, were now worth much more than those offered by the risky.

And what are the consequences?

The RWCR by favoring the financing of the “safer present” like sovereigns, residential mortgages and what’s AAA rated over the financing of the “riskier future, like entrepreneurs, leads to a more obese and less muscular economy.

All that RWCR really guarantees is especially large bank crisis, caused by especially large exposures to something perceived or decreed as especially safe, and that turn out to be especially risky, while being held against especially little bank capital. 

So what went wrong? Simply that regulators based their capital requirements on the same perceived risks that bankers already consider when they make their lending decisions, and not on the conditional probabilities of what bankers do when they perceive risks.

Any risk, even if perfectly perceived, will lead to the wrong actions, if excessively considered.