no, go study the UST market. imagine this; a 0.5% drop in yield to 0.25% is a doubling in price! this is the paradox in deflation that most ppl don't understand and why professional bond investors dive reflexively into UST's.
Where are you getting this notion that halving a bond's interest rate doubles the bond's price? I don't think you mean price... If a $100 face bond of some maturity is trading at $80, implying an interest rate of Y%, it does not mean that an interest rate of (Y/2)% implies a bond price of $160. Maybe I don't understand bond-market lingo, though... Clarify?
In any event, people are piling into USTs because the US is less worse off than other liquid sovereigns, and there are only so many places to put serious amounts of money. The other place is gold, which has clearly taken a good deal of the safe-haven flow. So, oddly enough, you get USTs and gold simultaneously being viewed as safe-haven assets....at least for a while.
A bond is issued for $10,000 for five years with a 5% coupon or interest rate, paid every six months. Then interest rates drop to 2.5%.
The annual payment of $500 ($10,000 x 5%) must equal a 2.5% payment. Doing the math, you discover that the face value of the bond must be increased to $20,000 so that the $500 fixed payment equals a 2.5% yield on the buyer’s investment ($20,000 x 2.5% = $500).
you can take this to infinity by halving the interest yet again, and again, and again, and again...and this is what the Fed has been doing and why bond investors keep buying.
edit: you'd better understand this concept carefully b/c it will affect your investing health.
Except that bonds repay the principle when they mature. In your example, and ignoring the discount function, the original bond has only appreciated by 20%. The next halving of the interest rate will only give 11%. A few more and you are down to 1%. Zeno noticed a couple thousand years ago that the sum of this series is not infinite.
Two other factors make this system less than practical. The first is that people will accept negative interest only when all the other places they could possibly park their money look really shitty, like back in 2008 when the commercial paper market broke the buck. The second is that bonds mature, plus new issues have been for shorter and shorter average durations since the 90s, so the possible influence of older issues is shrinking steadily.
But yes, people do actually do what you describe. Prior to the auctions, the primary dealers get their analysts to announce that the new issue will clear for a lower rate, which drives up the values of the bonds they are holding and also becomes a self fulfilling prophecy as the upcoming issue clears for less than it would have if the institutional investors that
are required to buy bonds hadn't picked them up early. Hey, free money for the primary dealers. Who here can guess who they are?
The problem is that it is on a collision course with the two factors I mentioned earlier, plus all of the usual problems, plus the demographic timebomb (pensions will start paying out, reducing the size of the pools that are required by law to buy bonds), plus some other stuff.
The questions, as always, are how long the game can keep on, and what will replace it? Armageddon is scheduled for "next week", or at least "real soon now", but it has been for 20, 30, 40, or 80 years (pick one).
P.S. If you are under 60, this should probably be a matter of great concern to you.