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$\begingroup$ The interesting part is that since we don't know the final cost, the estimated cost for the cost estimate would in this case range from \$300 million to \$75 billion. $\endgroup$
– Jakob
Commented Jan 24, 2014 at 8:21
$\begingroup$ That uncertainty goes down quite a bit as you spend that first $300M. So you'll know by then how much you need to spend on the planning. $\endgroup$
– Mark Adler
Commented Jan 24, 2014 at 14:59

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