And the central bank doesn't lend directly. It merely manipulates the rate at borrowers borrow from lenders, and hence manipulates the money supply.
And isn't it all about real value? If you lend at minus 1% but there's a deflation of 2%, you still make a real profit, right?
To reiterate on the Taylor rule point. Policy is not set by just by the Taylor rule, period. The Taylor rule happens to _replicate_ the actual policy for some periods of time (understandably not at the peak and trough of the cycle). As I said it is useful, because it provides some intuition. But the BOJ and the govt did not handle policy well; whether the BOJ followed the Taylor rule isn't relevant.
Never said the Taylor rule is fundaments of the CB's policies but it does show they reacted similarly to changing economic conditions.
3. Consumers are best thought of as making large purchasing decisions (eg housing) based not on income but on expected future wealth. The relevant measure is not debt to income but debt to expected future wealth. The implications of this behavior are that any positive or negative effects are spread out over many years, and so are more managable. Also, increases in expected future wealth, which may not be reflected in current income, would increase demand for housing and provide a possible explanation for the bubble.
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