That might sound like a lot, but Dr. Raina Merchant, the lead author of the study, puts it in perspective.

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After we wrote about the study, we received several comments from merchants who said that merchant fees were eating into their budgets.

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He was first elected to the Commons in 1970, after a career in the merchant navy, where he had been a leading activist in the National Union of Seamen, and study at Oxford's Ruskin College.

BBC: John Prescott