MODERN tools of data analysis — fast computers, smart software and vast troves of digital information — often open the door to new insights. Consider the subject of jobs in America.

For decades, the assumption has been that small business is the economy’s dynamic engine of job generation. Look at the numbers broadly, and that is the irrefutable conclusion: two-thirds of net new jobs are created by companies with fewer than 500 employees, which is the government’s definition of a small business.

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