...suppose that at the moment real wages or inflation begin to rise, the central bank tightens monetary policy. This would raise the cost of capital, and could be interpreted as an attempt to prevent real wages rising. ... Monetary policy, which in theory is just keeping inflation under control, is in fact keeping real wages and productivity low.
Monetary policy makers would describe this as unfair and even outlandish. A gradual rise in interest rates, begun before inflation exceeds its target, is designed to maintain a stable environment. ...
I also have another concern about a monetary policy which tightens as soon as real wages start increasing. What little I know about economic history suggests an additional dynamic. As long as the firm is employing labour rather than buying a machine, there is no incentive for anyone to improve the productivity of machines. The economy where real wages and labour productivity stay low may also be an economy where innovation slows down. The low productivity economy becomes the low productivity growth economy.
[The extract does not fully reflect the argument in the post -- see here for more.]