One, it impacts productivity per worker because migrant skills often complement the existing population’s.

第一，它会影响每个工人的生产率，因为移民技能通常会补充现有人口的技能。

But it could just mean that productivity per worker has risen, perhaps because of poorly understood things like remote working.

但这可能只是意味着每个工人的生产力提高了，可能是因为像远程工作这样的不太被理解的因素。