Do migrants have a positive effect on the economy?

There's perhaps not too much empirical evidence from this generation of migrants that is grounded in economic rigour or analysis. It's fair to speculate that most research done might have a bias towards finding a positive outcome or be sponsored or funded in such a way as to make this a distinct possibility - the agravation that would be caused by a negative finding to such a piece of analysis might now be worth publishing such a finding.

It's fair to say that American has until recent years been the bastian - a beacon for positive contributions to the economy...Trump is a second generation generation migrant. Steve Jobs was as, the current chief product designer and a Board member wad educated at Newcastle University..not even one of the renouned Uk Universities.

Ditto in the UK George Soros is not first generation British and many of the current Times Rich list were not born in the UK either..many have come from South East Asia and the sub continent.