Not at all an economist, but as a few interestingly placed stores yesterday recalled, what sunk the veer rightward in the UK recently was the cost of financing government debt, after the costings on the changes were published. Treasury yields seem to be on the uptick; I suppose the next gradation of the news cycle would be some hard math on the up-front costs actually being incurred. #notexpert
Of course, another interesting thing about the UK example is that the PM's rival and successor was likely in the city, actively briefing against the plan. If this veer does go south due to these sorts of hard costs, the second-order danger might be an emerging internal logic that everyone needs to follow the chosen guide--or else.
Noted on the first day of the administration that the internal civil-service noncompliance terms were very odd. Sometimes there's a bit of an art in determining which aspect of the universe is next in the great spinning-wheel slot machine of eternal return.