Interesting! and a completely different approach to your typical economist.
Orthodox economics has little to say about power dynamics.
The hallowed supremacy of the market mechanism is premised on the idea that exchange is free: individuals trade according to what will benefit them, constrained only by their income and their tastes (and the technological limits on production) and, as all of these indivuals make choices that will optimise their own lives, the result is that everyone ends up better off. Conventional economists do not really do class analysis - the individual is the unit under analysis.
There are, however, Marxist economists, say, or feminist economists, who would analyse at something more like a class level. But this is non-standard, and you don't hear anything of this in government. (Or certainly I never did.)
Orthodox economists would, however, acknowledge the influence of, say, social norms in influencing behaviour, as per the stuff that the Behavioural Insights Team do. but this is different again.
The introduction of the equality impact assessments was, I imagine, geared at compensating for the economist's lack of consideration of impacts on different groups - but they are focused on examining the specific impacts of a specific policy on specific groups, rather than thinking more widely about power in society.
Re extra dough for fat cat builders being a problem in its own right - I think its fair to say that we (boldly speaking for govt economists here) wouldn't even think about this. The perspective is:
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government doesn't object to the richer getting richer. It's better if poorer people get richer, but anyone getting richer is felt to be a good thing.
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they get a one-off payment for services they provide. This is free, fair exchange - and, in a viable project, the benefits (which may accrue to women, men, poorer groups etc) will outweigh the cost of this payment.
Economists could conduct appraisals that took this into account, by weighting income gains to the richest groups negatively, so that a project would cease to be viable if it made the rich too rich. I've never seen this done.
An alternative approach would be to impose a windfall tax on the "winners" from one-off government projects. Can't imagine this being imposed on builders though, or you'd never get them to build another road or whatever for you.
So it's a completely different perspective, and it misses a lot - but I suspect that much of this stuff would be completely intractable in the absence of a fairly simple framework for making decisions.
I probably have digressed wildly. Am realising that although a lot of this stuff is obviously a bit mad, I think I actually miss it! :D