>>40581940It literally isn't, unless your entire view of "the economy" is GDP and not societal health.
Sure, more people in a country can lead to more people buying stuff.
It also leads to more crimes such as theft.
Then there are issues such as healthcare wait times going up, taxes going up to fund the benefits for the immigrants, strain on schools, increased traffic on the roads, increased water and energy usage, for example, water doesn't just magically come out of a tap.
It has to be collected, treated, and stored in reservoirs.
If demand is higher than the amount collected and stored, you get droughts and hosepipe bans.