You're complicating. Gov provide a service. It doesn't and should not care about growth.
It need to provide it's citizen 47 services in Kenya.
None of those services is economic growth.
It should provide me with paved road, piped water, security, etc.
If gov focus on that - and leave the economy alone - the economy will grow.
You cannot think with PROFIT motive in PUBLIC sector. It's BULLSHIET.
Railways are not suppose to make profit or the public buses in California.
Public sector is NON_PROFIT. Focus on providing a services to the citizen - all will be easy.
Complication should only arise once you have done the basics.
As to where to get money - tax - use the tax to develop or borrow with taxes as leverage.
Gov is not a business. All gov should care about is finding money to provide public non-profit services to as many citizen as possible.
Their balance sheet should ready - we provided 1m piped water to residences - not the economy grew. That is private sector job.
Pundit I think the debate we need to have is the development model... because the premise of hard infra as "basic" - is pegged on its criticality as a growth factor.