Earlier quoted context omitted.
This could not be more wrong. Current central bank rates are high compared to market rates for stores of value, otherwise people, banks and businesses would not be keeping so much of their savings in idle excess fiat. I keep some musings about this here if you are curious: http://bessiambre.tumblr.com/
Eh? The Federal funds rate has been at 0.25% since 2008, if it were to go any lower we'd be in negative interest rate territory. The fed has only just started scaling back their asset repurchase program (aka 'QE' for 'quantitative easing'), but just like the previous 3 times (in ~5 years) it supposedly wanted to stop 'printing money', another round of QE is just one big stock market correction or housing market crash…
Risk adjusted market returns are clearly in negative territory otherwise we wouldn't have these piles of idle reserves even at -2% real return.
> for malinvestments (e.g. the shale oil industry...
Malinvestment is not something that exists under any mathematically consistent macroeconomic model but even if we try to tie the word to a somewhat sensical meaning, the most "malinvested" form of savings, short of using the money to hire people to destroy property, is to keep the savings as excess idle money. Savings have a return of near -100% to the aggregate economy when they are turned into uninvested idle fiat. The returns are even lower than -100% if you consider the welfare paid to the unemployed this results in.
Even if the shale oil industry gets a very poor return of -50% it would still be better for economic value creation than building excess fiat. Of course central banks did not cause the shale oil troubles as they set their rate to imply anything not having at least -2% risk adjusted real returns is not worth doing. Shale oil went way below that because of factors independent of central banks.
If a monetary bubble ends up bursting it will be because central banks have been too tight, making fiat keep its value above market safe returns and getting people and banks to stockpile it instead of investing in the private economy, effectively turning savings into mere intrinsically valueless paper which doesn't have any economic activity, any stuff or means of production to back them.