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"Without data, you are just another person with an opinion" Andreas Schleicher, "It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" Upton Sinclair "How do we know economists have a sense of humour? They use decimal points in their forecasts." William Bernstein "Productivity isn’t everything, but in the long run it is almost everything. A country’s ability to improve its standard of living over time depends almost entirely on its ability to raise its output per worker." Paul Krugman, The Age of Diminishing Expectations (1994)

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