On one side, factors such as institutions may put upward bias on the coefficient, if areas with weak institutions experience a larger increase in violence due to less effective police and judicial services and greater out-migration if employers and job opportunities locate elsewhere.
A common claim in popular discussions of migration is that employers prefer to hire workers with limited residency rights—such as temporary or undocumented migrants—over equally qualified natives, because these migrant workers are willing to work harder, for longer hours, or for less pay.
Legislation and bilateral agreements can bring order to migration flows: Seasonal employer programmes in New Zealand and Australia - which offer short term employment to unskilled workers from the Pacific - are small, limited initiatives, but they serve as a useful demonstration effect and provide a base from which to build more ambitious agreements.
The breakthrough follows the government's offer to amend migration regulations to ensure employers have made genuine efforts to recruit Australian workers before seeking them from overseas under a work agreement.
Overtime differences may bring the gap down to £3,000 or £4,000 but the migration experts say that employers should go through the resident labour market test (ensuring there is no suitable worker within the UK workforce who could do the job) to meet concerns about undercutting.
Despite these conditions, however, it has been recognised that a gap may exist between the migratory assessment and the skills or licencing requirements demanded by Australian employers (Joint Standing Committee on Migration 2006).
The dampening identified here may appear to contradict the shift in emphasis of skilled migration in favour of Employer Sponsored migrants, who must obtain an offer of employment prior to submitting their visa application.
The reforms that we consider tightened the conditions for independent skilled visas at the same time as employer sponsored migration was being promoted by the government.
Approximately 5 percentage points of this aggregate effect can be attributed to a shift in emphasis of the system in favour of Employer Sponsored migration.
This second set of results helps us to determine how tightening of eligibility requirements for GSM visas and promoting Employer Sponsored migration have influenced the quality of the jobs held by skilled migrants.
This is important as employer sponsored migration is commonly found to select migrants with systematically different characteristics to those favoured by points based systems (e.g. Hawthorne, 2011; Czaika and Parsons, 2015).
