MEZZANINE wrote:@ Deni, you say banks have to buy government bonds, not true. Banks have to hold capital and prefer to hold governments Bonds ( which the law allows them to call capital ) at low interest income than hold cash reserves earning no interest.
Cash reserves earn at least the EONIA/SONIA/USONFFE/... and can be liquidated overnight. Bonds earn more, but they bind liquidity long term. Considering liquidity cost (and not even credit spread risk), you might realize that banks do not "earn" that much by holding government bonds.
Further, bonds are NO capital. You will find the "capital" on the right hand side of a balance sheet. Bonds are
assets and as such, they belong on the left hand side. Bonds are thus as much "capital" as the mortage your house bank gave you. You can look up your basic accounting text book
What makes governement bonds different from your mortage loan, is that their risk weight is zero thus holding governement bonds does not cost you (tier 1)capital (and yes, thats the most costly one).
Your mortage on the other side, has a risk weight of 100%, meaning that for every 100 € of it, a bank has to hold 8 € of capital and can finance the other 92% through taking debt itself.
And guess what, the debt the bank takes is covered by what? Right, government bonds!
The calculation is simple: covered debt is cheaper than uncovered one, means less re-financing cost, less re-financing cost means cheaper interest rates for the mortage you take.
Simple, isn't it?
In the end, by setting the risk weight of government bonds to 0 procent, the regulator and thus the law, are forcing banks to buy governemnt bonds in order to provide coverage for their own debt without contracting their lending business and thus avoiding a credit-crunch and whatever comes from it