This is sometimes known colloquially as r*. Policies which boost r* mean that a given interest rate is likely to impart greater stimulus. Or, put differently, they mean the same level of demand in the economy can be achieved with a higher interest rate. And a “pivot” in the mix of policies, with somewhat less of a contribution from monetary policy and more from structural policies, would probably be desirable. Not least, it could help mitigate any adverse impact of accommodative monetary policies on productivity or the distribution of income and wealth. Conclusion  Productivity is a gift for rising living standards, perhaps the greatest gift. It is not, however, one that always keeps on giving, as recent events attest. Whether in supporting living standards, or in shrinking their distribution, tackling the global productivity puzzle is among the most pressing public policy issues today. If history is any guide, there is unlikely to be any single measure which puts productivity growth back on track. But measures which support the long tail of companies, currently operating at low levels of productivity, have the potential to do considerable good. As Olympic athletes have shown, marginal improvements accumulated over time can deliver world-beating performance. Applying those marginal gains to the population of UK companies could significantly improve UK living standards, even if those are harder to measure than gold medals.
Yet given their scale, the returns to modest improvements in these firms could be dramatic. As a thought experiment, imagine productivity growth in the second, third and fourth quartiles of the distribution of UK firms’ productivity could be boosted to match the productivity of the quartile above. That sounds ambitious but achievable. Arithmetically, that would deliver a boost to aggregate UK productivity of around 13%, taking the UK to within 90-95% of German and French levels of productivity respectively. The policy question is how to effect those improvements. One idea which offers real potential comes from the Productivity Commission chaired by Sir Charlie Mayfield. 64  This starts from the assumption that not only  is there a long tail of companies, but that many are unaware of that fact. For the same reason most car-owners believe they are above-average drivers, most companies might well believe they have above-average levels of productivity. In fact, we know most companies have below-average levels of productivity and a large fraction of them have seen no productivity improvement for several decades. The Mayfield Commission aims to create an app which enables companies to measure their productivity and benchmark themselves against other companies operating in similar sectors and regions. By shining a light on companies’ relative performance, the aim is that this would serve as a catalyst for remedial action by company management. Indeed, the aim is to provide firms not only with a means of benchmarking themselves, but with tools to improve performance along identified areas.