I looked into this a bit for an assignment I had last semester, in which I compared the gap between Indian Americans and Bangladeshi Americans. A lot of Bangladeshi immigrant families end up with jobs that don't pay very well, mainly because many came to the U.S. through a special lottery for green cards rather than through student or work visas (which is likely what these ethnic groups did). Also, Bangladeshis usually do not immigrate with transferrable skills, nor do they get re-educated, and so they often start working as unskilled/semi-skilled laborers almost as soon as they arrived. This probably is not unique to Bangladeshi Americans and can partially explain this gap between different immigrant ethnic groups.

I've seen this myself. Whenever my mom goes back to her home country, Bangladesh, to see her family, she brings all sorts of goods from NYC. I was under the impression that these goods didn't exist at all in Bangladesh, but it turns that was not the case. For example, she bought a decent amount of drugstore makeup for them and mentioned that they requested some of it. She also said that they have most of these same (drugstore) makeup brands in Bangladesh; it's just way more expensive and therefore not worth paying for the quality, so they ask her to bring it for them when she visits.