The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK ( Trefis) -- As Groupon (GRPN - Get Report) begins trading in public markets, we look back into its short history to see how the company's market valuation has fluctuated since its inception. In recent months, the firm has come under severe scrutiny for some of its accounting practices, cash burn rate and other financial details that have been revealed in the Securities and Exchange Commission filings, which have been revised several times.
Groupon Already a Tough Sell
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