Indeed, in a perfect world we might wish to see workers moving from higher-productivity to lower-productivity firms to enable good practices and processes to be effectively diffused from the upper to the lower tail. 39  The US job-to-job flow data are more comprehensive than those in the UK at picking up job moves within a given quarter. This methodological difference means that estimated US churn rates will be stronger than those in the UK, but this can only explain part of the gap between the UK and US job-to-job transition rates. 40 We combine the ASHE and BSD data for this analysis. 13  All speeches are available online at www.bankofengland.co.uk/speeches  13  Table 4 shows a matrix of transition probabilities for workers between four quantiles of the probability distribution for companies. 41  All of these probabilities are conditional on a worker moving in the first place  and so sum horizontally to one. Two points stand out. First, there is a high degree of stickiness in job moves. Workers tend to move between jobs in the same productivity quartile. In the upper and lower quartiles, around 40% of jobs moves are within-quartile. The second point is that there is rather limited evidence of technological diffusion being supported by jobs flows from firms in the frontier to the long tail. The probability of a worker for a company in the upper quartile moving to one in the lowest quartile is around 20%.
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