Time and time again this proven again and again.

Thirty years of data show "refugee burden" is a myth: Migrants to Europe have been a significant economic benefit

Migrants and asylum seekers provide big net benefits to their host countries reports a new study in Science Advances by three French economists. The researchers used 30 years of data on migrant and asylum seeker flows into 15 western European countries. They were seeking to find what effect permanent migrants including refugees who sought and obtained asylum between 1985 and 2015 have had on subsequent GDP per capita, unemployment rates, government spending and tax collections in those countries.

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Once the economists crunched the numbers they found that migrant flows during the past 30 years have had substantial positive effects on European economies. Specifically, the researchers report that migrants "significantly increase per capita GDP, reduce unemployment, and improve the balance of public finances; the additional public expenditures, which is usually referred to as the 'refugee burden', is more than outweighed by the increase in tax revenues."