Can Keynesian work?

I don't believe in it,
But I suspect it might work if the government gives up its monopolies and be as accountable as other companies with whom they will be competing against when it comes to providing services.
Seriously I do believe private companies can build low-cost housing at a lower cost and with higher quality albeit at a higher price due to the limitations of technology. But remember even the richest most glorious emperor two hundred years ago didn't have flowing water and indoor plumbing. And what is the point of affordable but low-quality housing?