That kind of analysis has been done and occasionally is done again in Sweden by proponents of 'local help' versus immigration. Unfortunately those who do this type of analysis are immediately stamped with a 'racist' stamp in Sweden - or, if 'racist' does not work because the author happens to be an immigrant him- or herself (e.g. Tino Sanandaji [1], an Iranian-Swedish economist who publishes on these subjects) terms like 'husblatte' (translates more or less to 'Uncle Tom') are used - and the research is deemed tainted by a large majority of politicians and media. This is unfortunate as it makes it close to impossible to base policy on objective information on these subjects. Cracks are starting to appear in the façade of 'correctness' but this process is slow and problematic.
Meanwhile a single fact should be enough to convince the naysayers: the fact that the expected extra costs (that is, above the already budgeted costs) for migration into Sweden [2 - Swedish] is double the total budget of UNHCR [3], the UN commission responsible for helping refugees all over the world. For that money Sweden took in about 163.000 people (refugees and economic migrants who pose as such). UNHCR is responsible for 60 million refugees. Part of the increased costs for migration into Sweden are taken from the budget for international help and co-operation so the effect is even stronger that way.
I wonder if part of the reason why there is so little analysis of such a mainstream and expensive problem is that it could be career suicide to get the wrong answers in your study.
Meanwhile a single fact should be enough to convince the naysayers: the fact that the expected extra costs (that is, above the already budgeted costs) for migration into Sweden [2 - Swedish] is double the total budget of UNHCR [3], the UN commission responsible for helping refugees all over the world. For that money Sweden took in about 163.000 people (refugees and economic migrants who pose as such). UNHCR is responsible for 60 million refugees. Part of the increased costs for migration into Sweden are taken from the budget for international help and co-operation so the effect is even stronger that way.