Remain campaigners have said the plan would be economically disastrous and could even lead to higher levels of net migration.
Levels of net debt among US non-financial companies, he calculates, are actually 15% higher than before the financial crisis.
That means that, without continuing high levels of net migration, even deeper spending cuts and higher taxes would be needed before Britain reaches Osborne's sunshine-filled economic pastures.
Groth added that lower levels of net tension on grass and indoor courts would make the ball more likely to dribble over.
Without the UK's current levels of net migration, the chancellor would be faced with the choice of missing his fiscal goal or achieving a surplus by adding more spending cuts and tax rises to his existing plans.
He has spoken about the need for more integration of some immigrant communities - especially Muslim ones - while continuing to welcome high levels of net immigration into Britain of over 150,000 a year.
"In other words, it is correct that EU migration has contributed to recent high levels of net migration and that new restrictions on EU citizens could reduce overall flows.
It is true that areas such as Boston in Lincolnshire and Fenland in Cambridgeshire, which have had high levels of net migration, also feature in the top 10 leave areas.
Thomas Cook has come under pressure because of poor performance in the UK and high levels of net debt, which is expected to reach close to £900m by the end of next month.
He added that Canada, Norway and Switzerland, all countries sometimes highlighted by Brexit campaigners as representing a model for a better relationship with the EU, have all experienced higher levels of net immigration.
