We have a guest post over at No Minister.
The conclusion:
Ultimately, I doubt that the government has a role in investing in large scale projects in the absence of “externalities”. The best thing the government can do is make sure that the economic environment is open and transparent – such that firms with greater technical knowledge, and a better understanding or the risk-return trade-off, can invest in the most efficient way possible. The purpose of government is to oil the wheels of commerce – not to build the cogs.