Why is it difficult to estimate mega project (i.e., costs and benefits (i.e. airports, stadiums, etc.) costs

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Why is it difficult to estimate mega project (i.e., costs and benefits (i.e. airports, stadiums, etc.) costs and benefits?
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Project Management The Managerial Process

ISBN: 978-1259666094

7th edition

Authors: Erik W. Larson, Clifford F. Gray

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