I don't understand your point.
The bond Market can't disappear overnight all the debt in the world has to be held by someone. Or are you suggesting that we all just walk away from our obligations?
Professional money managers calculate the expected return on a debt obligation by assessing the net present value of the future stream of income payments in the context of the credit worthiness of the issuer and term of the bond.
They have a positive expected return otherwise why would they buy?
Are you suggesting an alternative universe where basic mathematics no longer functions just because bonds have delivered positive returns for the last three decades?
On the first point, no investment manager should ever base their investment decisions on what is good for the overall bond market. Their decision should be made with the best intention of the fund.
Secondly, when you state: 'they have a positive expected return otherwise why would they buy?', they are buying because of the herd mentality that affects money managers and trustees as much as or more so than the general public.
There is nothing 'professional' that sets their investment decisions above all others.
Bonds have become the in thing for pension funds since they took a hammering after the equity bubble crashed in 2000 on the highest market P/E in recorded history.
Bonds have replaced equity inflows over the past decade driven largely by pension funds, desperate for a steady return despite the now awful fundamentals for this asset class.
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Both pension funds and retail investors are piling into bonds at completely the wrong time. In 1981 when yields hit 16% and inflation liklewise it was the time to buy bonds.
Now that yields have made multi decade year lows there is only one way to go for yields and that up, with prices down.
The 10 year treasury says it all-
http://finance.yahoo.com/echarts?s=...on;ohlcvalues=0;logscale=off;source=undefined
Pension holders offering to lend to the USA government at 3% for a decade, even if they are going to hold until maturity does not constitue having 'a positive expected return'.
The risk reward balance for bonds is now skewed significantly to the downside.
Breaking even for bond holders over the next decade based on the current price of bonds compared to their fundamentals (negative interest rates, debt situation, deficit situation, unfunded liabilities, printy printy, etc) will be near impossible. Holding to maturity will not alter this fact.
The risk/reward for bond holders was skewed significantly to the upside 30 years ago at the start of the current secular bull market.
Bond yields have recently double bottomed, a classic case that yields are likely to rise from here.
Contrary to popular belief amongst many on here, asset class returns vary over time dependent upon where the asset class in question is in its secular cycle.
It is incorrect to believe that buying bonds or be it equities or commodities will return a set x % per annum. Over the very, very long term perhaps but over the investment life of most investors (20-40 years) it is imperative to pay attention to where each asset class is in its secular cycle. The cold hard fact is that secular cycles can be as long as an investor's timeframe.
Bonds are 30 years into a secular BULL market. One of the longest runs in economic history since bottoming in 1981 on multi decade high yields.
Equities are 1/3 to 1/2 way through a typically lengthy secular BEAR market that commenced in 2000 on the highest P/E in history.
Commodities are 1/3 to 1/2 way through a secular BULL market since bottoming in 1999/00 on inflation adjusted lows, not seen since the great depression.
No doubt pension funds will be pilling into precious metals in a decade's time as the commodity secular bull peaks.