Understanding compounding

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There is, apparently, no hard evidence that Albert Einstein ever described compound interest as the eighth wonder of the world, although the quote is widely attributed to him. Whoever did or did not say it, there is an underlying truth about the power of compounding. It is not well understood however. And pensions is a case in point. The pensions triple lock is an example of compounding in action – at least, in the years where both wage and price inflation are below 2.5%. In those years, the third element of the formula – the increase by 2.5% – increases the spending power of the state pension (albeit by a small amount) compared to inflation, but because that increase is a permanent increment to the pension, it is part of the sum on which the following year’s uplift is calculated. Over time, it will serve to increase the spending power of pensioners – which was, of course, the original intention, following the years of decline in pensioner spending power after Thatcher broke the earnings link.

What it means, though, is that those who benefit most from a long term implementation of the triple lock aren’t today’s pensioners, nor those close to retirement age, but those furthest away from retirement age, giving the power of compounding time to work its marvels. It’s strange how poorly understood this is.

This report from Saturday, tells us two things about Generation Z and millennials. Not only are they worried that their state pension will be worth less when they eventually retire than it is today – they are also the group most keen on abolishing the triple lock. On the other hand, those keenest on retaining the triple lock – existing pensioners and those about to retire – are the groups who stand to gain least from it. It's an inversion of the reality.

It highlights a lack of understanding of the basic mathematics of compounding, certainly. But it also highlights two other things. The first of those is an essentially short-term outlook on finances. And the second is the power of relentless propaganda telling us that a slow increase in pensioner spending power over the long term is somehow unfair to those who are working and paying taxes today, ignoring the fact that they will be the beneficiaries. As ever, the questions we should be asking are firstly, what is the ‘right’ level at which to set the state pension, and secondly, who benefits from the abolition of the triple lock. The first is a difficult question; it’s easy to see why politicians and governments try to avoid answering it, because the answer is almost certainly going to be ‘significantly higher than today’s level’. As for the second, well, as long as politicians and governments continue to promote the household analogy for government finances, those who benefit from reduced government spending (and a consequent reduction in taxation) will always be those who hold the most wealth and the highest incomes. What a surprise.