Concerns have resurfaced about a possible tech bubble even after a strong debut on the stock market for the latest highly valued but loss-making technology start-up. Square, a US mobile payments firm founded and run by Twitter co-founder and chief executive Jack Dorsey, fared well on its outing as a public company on the New York Stock Exchange. However, the flotation was priced at $9 per share, below the $11-13 range it had guided...
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