Maybe a rule that says "Companies can only hire non-native workers if their profit is below XX%." (I realise this is a game-able statistic so would need to be a

Maybe a rule that says "Companies can only hire non-native workers if their profit is below XX%." (I realise this is a game-able statistic so would need to be a bit more complicated than that). Of course, the other option that companies can take is to increase productivity by investing in automation, training etc so each worker provides more output to justify their higher cost.