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If you need inspiration and motivation to change the way you work and increase productivity, millionaire entrepreneurs with amazing rags to riches stories can help you. These stories aren’t of super-intelligent humans or lucky ones but of superlative grit, determination and insatiable hunger to achieve the unachievable.

Here are 10 stories of self-made millionaires and billionaires that will undoubtedly motivate you to work harder and smarter.