on average in each working hour around 1,550 people move from being jobless to being employed, and about 1,530 people leave employment and become jobless
At the same time in any given period very large numbers of people move into different jobs, and from full to part-time work (and vice-versa), without actually changing employment status. This means that the extent of changes in the labour market must be much greater than even that suggested by these simple gross flows data.
(From Bruce Chapman and Kiatanantha Lounkaew, How many jobs is 23,510, really? Recasting the mining job loss debate.)
I AM a huge fan of randomised trials. Last year at Google the search team ran about 6,000 experiments and implemented around 500 improvements based on those experiments. The ad side of the business had about the same number of experiments and changes. Any time you use Google you are in many treatment and control groups.
(From Hal Varian, discussing randomised policy trials)
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