as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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describe what a "unicorn startup" is.
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a unicorn startup is a start-up company that has achieved a valuation of over $1 billion. these companies are often venture-backed and have achieved considerable traction and success in the market. some famous unicorn startups include uber, slack, airbnb, and dropbox.
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