Do illegal migrants compete with national workers?

Conclusion  Some evidence regarding the effects of illegal or irregular immigrants on the receiving country's labour market is available but it is very limited considering the complexity entailed. It is clear that foreign irregular labour damages native workers more than regular foreign labour, but irregularity in employment is very difficult to pursue in countries with a large informal sector. Destination countries should first fight complete illegality in the country and in the job at any cost, and leave the labour office with the responsibility of providing incentives to get a legal job through frequent controls and high penalties.