In theory, the higher rates banks can charge their borrowers are passed through to the savers from whom the banks must borrow. Some of it has indeed been passed on to depositors, but the limited competition between the big four banks has allowed them to drag their feet.

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So the “significant distributional effects” Lowe refers to are partly that the young tend to be squeezed hard, while the old get let off lightly and may even be ahead of the deal. And the banks always do better when rates are rising.

All this makes the use of interest rates to control inflation unfair in the way it affects different households. And note this: how is it fair to screw around with the income of the retired and other savers? They do well at times like this but pay for it when the RBA is cutting interest rates to get the economy back up off the floor.

But as well as being unfair, relying on interest rates to slow the economy is a less effective way to discourage spending. Because raising interest rates directly affects such a small proportion of all households – the ones with big mortgages – the Reserve has to squeeze those households all the harder to bring about the desired slowdown in total spending by all households.

In other words, if the squeeze was spread more evenly between households, we wouldn’t need to put such extreme pressure on people with big mortgages.

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Lowe has been right in saying, “Sorry, interest rates are the only lever I’ve got.” What he hasn’t acknowledged until now is that the central bank isn’t the only game in town. The government’s budget contains several potential levers that could be used to slow the economy.

We could set up an arrangement where a temporary rise in the rate of the goods and services tax reduced the spending ability of all households. Then, when we needed to achieve more spending by households, we could make a temporary cut in the GST.

If we didn’t like that, we could arrange for temporary increases or decreases in the Medicare levy on taxable income.

Either way of making it harder for people to keep spending would still involve pain, but would spread the pain more fairly – and, by affecting all or most households, be more effective in achieving the required slowdown in spending.

The least painful way would be to impose a temporary increase or decrease in employees’ compulsory superannuation contributions. That way, no one would lose any of their money, just be temporarily prevented from spending it at times when too much spending was worsening the cost of living.

Our politicians and their economic advisers need to find a better way to skin the cat.

Ross Gittins is the economics editor.

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