Ill try.. danish morgages are based on bonds, just like government bonds, but realestate instaed. So the issuer just takes a small cut, dosent matter for them if rates are 10% or negatve 1%, (they take about 0,6%).
Now who buys the bonds then and “loose” money? Mostly institions, pensionfunds, corporations and normal investors. They take on theese investors, because they have to.. rates in banks are even lower (even more negativ), and deposits are only insured for about 100.000euro. These bonds, while negative, are more secure, and less negative.
People keep missing the rate. The effective annual rate of the loan is 2% because you don’t get the full amount payed out/ the principle is higher than the loaned amount.
This is effectively saying that someone is willing to loan you 1mil, and pay you negative interest on a loan of 1.1mil as long as you pay a fixed payback per month.
So end of line you still payed more than you got, but every month instead of paying a bit more than your fixed payback, it’s slightly lower. Bank still makes money selling you the loan, investors still get more money back than they invest. Only thing noteworthy is that some of the math that used to be related to the fixed monthly positive interest is now covered by the upfront rate of getting the loan.
They are buying at a conversion rate. So they buy for instance a 100k bond for 95k, since the the time is fixed and payments are forced, you end up guaranteed a 2.1% net interest even though the running interest on the principle from month to month is fixed.
It seems clear that the bond holders will not be getting any positive coupon and they are guaranteed to lose money. That's why this is in the news and we're talking about it.
As far as I understand the issuer cannot just sell the the bonds at 105% or whatever to account for the loss upfront with the price converging to 100% in 10 years (because these are callable bonds) and apparently they have some technical problems to implement negative coupons: "The negative callable bond is creating some technical difficulties. Jyske said it will initially be registered as a floating-rate bond until the systems of VP Securities, Denmark’s central securities depository, are adapted to handle negative coupons for fixed-rate bonds."
In case you think negative yields cannot happen, it is definitely possible. Many government and corporate bonds in Europe are trading at a price which is above the value of the nominal plus all the remaining coupons.
Germany has issued last month zero-coupon bonds which were sold above par and they are trading now at 106.87 euros (and the only thing you will get back if you hold them to maturity is 100 euros in 2029).
The cost of storing gold isn't zero. If you have $100M of gold, you have to prevent serious organized criminals from stealing it. That can cost $500k/yr (ie, -0.5% return) for 3 shifts of security and a vault, cameras, insurance, etc.
Now who buys the bonds then and “loose” money? Mostly institions, pensionfunds, corporations and normal investors. They take on theese investors, because they have to.. rates in banks are even lower (even more negativ), and deposits are only insured for about 100.000euro. These bonds, while negative, are more secure, and less negative.