In other words why does one person staying a year have any more impact that 3 people in combination staying for a year, in both cases we have one person here for the same duration of time. Whether it's the same person or not is largely irrelevant.
This seems to be exactly my point. The impact of those 3 people in combination is not equal to three people staying for a year, so the sum Guido does is nonsense, instead the short term immigration figure needs to be divided by some unknown factor to measure it's impact and, even then, can't be compounded onto long term immigration because it measures a different thing.
I take your point that in the latter scenario those people are less likely to create costs associated with a specific individual being here longer, but not to the extent where the ONS should be taking out and not even mentioning the short term impact.
I agree that the ONS should be monitoring short term immigration, but it's not something that is "taken out" of long term immigration figures; it's a different thing and so has not been included. The most important difference is, of course, that it does not compound: whereas if we have net long term immigration last year of 250,000 and this year of 250,000 there are 500,000 more people in country at the end, short term immigration of 250,000 last year and short term immigration of 250,000 this year means we end up with the same number of people in the country that we started with; it's only when the levels change that there is any net change in population.
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