Surely there is some things that a large organisation has an advantage in doing. After all in modern economies we are more specialist's then jack of all trades. So unless you are an oddbody member it is unlikely that you belong to a community of diverse skill sets. This puts groups ie companies and government in an advantageous position. Economies of scale can also help larger organisations.

What sets the difference is the management of those large organisations to see which one makes the most benefits of the money and teams it overlooks. And it's not which corporate badge, logo or trademark, or which side of politics as much as which organisation is accountable for its actions for both reward and punishment.

If it is actually infrastructure it should have a net benefit to the economy/well being of those who paid for it ie dams, roads, hospitals. I'd look at infrastructure that is investing in the countries future. Australia at the moment is spending $42 Billion (which since we have a population of 22 million about $600 Billion in US terms of cost per person) in fibre to the home infrastructure. That will have benefits in jobs, internet speed, and then 2nd and 3rd tier economic benefits (1st Tier ISP, 2nd Tier @ home ecommerce and remote workers, 3rd Tier being those who are benefiting out of supporting that economy ie post workers shipping the physical goods etc). Could it be done by business? Yeap. Would they ignore the Outback and further polarise the city vs the bush yeap. This is Australia tax payer money paying for an egalitarian solution.

Other ways to implement infrastructure well look at the X Prizes for potential alternatives.