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“Optimism bias”: Delayed or cancelled giga-projects risk $1.5 trillion worldwide loss 

Posted on July 4, 2025




Development staff in Los Angeles (Jose Gil/Dreamstime)

A report by UK-headquartered Mace has analysed 5,000 mega- and giga-projects worldwide, discovering that 11% are prone to delays or cancellation, with a possible lack of $1.5tn in international financial progress by 2030.

Mace defines a mega-project as a significant programme costing $1bn or extra, and a giga-project as costing $10bn or extra.

It says the variety of tasks in each classes – in sectors like power, transportation and high-tech manufacturing – have elevated by 280% since 2010.

The highest 10 present mega-plus programmes worldwide have a mixed complete worth of US $685bn, the report finds.

The US has initiated probably the most such tasks since 2010 with 1,663. India is available in second place with 729, Saudi Arabia has 577 and the UK has 484.

For giga-projects particularly, the US leads the pack with 88, adopted by India (43) and Saudi Arabia (43).

Mace interviewed 30 building executives with expertise of mega-plus tasks and located a level of consensus over why they go unsuitable.

A giant purpose was beginning too shortly for political causes with out sufficient thought or planning – the other of Oxford College mega-project scholar Bent Flyvbjerg’s recommendation to “suppose sluggish, act quick”.

“There’s strain to indicate progress,” stated one senior govt within the North American rail sector.

“That is most acute in tasks of curiosity to politicians who’ve short-term agendas. Many begin earlier than designs are full and earlier than individuals are really certain what the top product is. The cash is commonly launched in a manner that incentivises this behaviour too.”

One other downside the specialists flagged up is the pure human tendency to imagine that probably the most optimistic outcomes are inevitable on one’s personal undertaking whereas ignoring proof on the contrary from related previous tasks.

“What we are inclined to do on giant tasks is go in with a very optimistic place on prices which are sometimes based extra in hopes than on true details,” a managing director within the UK rail sector informed Mace.

Misusing price consultants

Specialists additionally agreed that an excessive amount of weight is given to price consultants’ early-stage estimates calculated earlier than detailed designs or constructability assessments by contractors are full.

“At its coronary heart, price consultancy is the artwork of figuring out change will occur and baking that in on the outset with an accurate threat and contingency mindset,” stated Ceri Evans, Mace’s international director for price and industrial administration.

The report concludes {that a} collaborative, shared-risk strategy tends to result in higher outcomes, permitting an as much as 13% discount in price and a 50% discount within the threat of delays.

“In observe, this implies purchasers, consultants and contractors … unifying behind shared visions, goals and tradition to work collectively in direction of the identical desired outcomes,” stated Davendra Dabasia, Mace Seek the advice of’s chief govt.

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