Hi Mona! "So once" doesn't mean anything as a unit, because the two words should be considered separately: "it is definitely less so / once your basic needs have been met". That is, once (when) you have met your needs, shopping is no longer such a source of happiness as it was before. I hope it helps! :)

less so = less a sourse of happiness once = after/by the time :)

Oh sorry I thought you're Spanish

It also means at that same moment.

Hi Mona! "So once" doesn't mean anything as a unit, because the two words should be considered separately: "it is definitely less so / once your basic needs have been met". That is, once (when) you have met your needs, shopping is no longer such a source of happiness as it was before. I hope it helps! :)