Why is it good for all to allocate their risk premiums adjusted investments according to the needs of their portfolio… except for banks?

Sir, Jonathan Wheatley writes:“Here’s a mystery: if emerging market debt as an asset class has had such a torrid time this year, why has it not suffered more outflows?” And to answer it he quotes Paul Greer, portfolio manager at Fidelity International: “People will look at what they are getting in the rest of the world, and they’ll say you know what? We’re getting paid for the risks.” “EM bonds resilient as investors are well rewarded for risks” November 2.

That which sounds so perfectly logical, is not what the banks can do, since the risk weighted capital requirements take no consideration whatsoever of the risk premiums banks can obtain. 

To top it up, these weights are formally portfolio invariant. Since you might think that because I am obsessively against that regulation I will give a biased version of it, let me extract verbatim the following from the horse's mouth, “An Explanatory Note on the Basel II IRB (internal ratings-based) Risk Weight Functions” 

“The model [is] portfolio invariant and so the capital required for any given loan does only depend on the risk of that loan and must not depend on the portfolio it is added to.”

And the reason given for that mindboggling simplification is: “This characteristic has been deemed vital in order to make the new IRB framework applicable to a wider range of countries and institutions. Taking into account the actual portfolio composition when determining capital for each loan - as is done in more advanced credit portfolio models - would have been a too complex task for most banks and supervisors alike.”

Besides the disastrous effect in our economy the distortion in the allocation of credit, credit risk-weighted capital requirements produce, is to guarantee especially large exposures, to what’s perceived as especially safe, against especially little capital, which dooms or bank system to especially severe crises, like that in 2008.

And this has been going on during 30 years and no one is allowed to ask regulators: Why do you believe that what’s perceived as risky is more dangerous to our bank system than what’s perceived as safe?

Clearly that is seemingly one of those questions that shall not be asked.

@PerKurowski