What was the approximate financial loss (adjusted to today's dollars) that Ford suffered from its infamous Edsel failure in the late 1950s?

In the annals of retail and product failures, few disasters compare to the Ford Edsel. Launched in 1957 after years of research and enormous marketing hype, this automobile represents one of the most expensive and publicized failures in American business history. Test your knowledge about this historic retail blunder that has become a business school case study on how not to launch a product.

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Approximately $2.5 billion in today's dollars
Approximately $500 million in today's dollars
Approximately $5 billion in today's dollars
Approximately $800 million in today's dollars