[qubex]

You’re thinking in what is known as “the big lump of employment” mode: i.e., that there is some fixed demand for total labour in a country and that it will be apportioned out according to the lowest salaries. This is generally countered with the idea that as population rises (including due to immigration) more support jobs are needed – for example, as population rises you need proportionally more healthcare, and those extra health workers will need more consumer goods which means there’ll be more stores to sell stuff to them and more cashiers & cetera.