Traveling the world there are several places where $150 a month is more than the locals make. And even where they aren't, there's things like free-camping, getting a place with several friends together, and so on.
Even in a first world country with $1500+/month average wage, getting by on holidays with €150-€200 is something a lot of younger friends do, if anything because they have to (not many saved from poorly paying and scarce regular jobs anyway). If you bunch up a few together, or just go camping, it's quite cheap.
Asia, Africa, Latin America, even parts of Europe.
For comparison, in Greece there are tons of young (and older) people actually working full time for ~ €400/month.
(Before the crisis, in say 2006-2010 those were called the "€700 euro generation" for making around that amount per month, then considered very low).
Here's a similar case in Spain: "“We’re not mileuristas. We are just poor. I wish I could earn €1,000, but my generation is earning between €700 and €800 a month,” he says, adding that he personally takes home around €450 a month for a 20-hour week, and describes himself as underemployed."
Even in a first world country with $1500+/month average wage, getting by on holidays with €150-€200 is something a lot of younger friends do, if anything because they have to (not many saved from poorly paying and scarce regular jobs anyway). If you bunch up a few together, or just go camping, it's quite cheap.