Poetryandwine, again with my second hand knowledge I understand that US funding for a econ PhD is six years but that the UK or rather what DS would have got had he taken up his LSE offer was five years even with a Masters. The missing year is the job market year which DS’ US University are generously funding. The problem element is the Masters which Universities tend not to fund, partly because most will be aiming for high paid roles in the City, and which can be major revenue generators. The LSE ten month programme for home students is over £31,000. Imperial charges even more for its management courses.
And that the big difference between STEM and economics is that in STEM your PhD is often based around specific research funding and that with economics you choose your own, but will want a supervisor with an interest in your field. And that rather than one long thesis it is possible to write three shorter ones.
Jobs are still really hard to come by. Or at least ones that allow time for research. And the market is international. The advantage, as said upthread, is that there are plenty of alternative employers for research economists, and they often pay extremely well. It is common for those aiming for academia to have to take one or two post doc years working as a reasearch fellow on short term contracts.
And sort of my point. Jobs are so very competitive so every little helps. Oxford followed by a top US University, hopefully with a few prizes along the way, might give you a better chance. There again being supervised by someone top notch at Warwick would presumably be equally good. And to get funding without a Masters is very impressive.
I suspect PhD funding in economics is harder to get as it is funded by the government not by industry research and there is not much of it.. (There may be exceptions, and presumably Oxford is rich enough to fund some themselves.) DS applied for a few in his Masters year fully expecting to have to take a year out and put more energy into it. He got two offers , and it is only in retrospect he realises how lucky he was. There is strong and world wide competition.