Why do people from poorer backgrounds have low aspirations

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I may not be explaining myself well here so please bear with me!

I've seen on here a few times where it's been mentioned that people from poorer backgrounds / deprived areas don't have higher aspirations. It seems they can do better but don't.

Just wondering why this is and what would help to change it.

Reason I'm asking is I'm from a por background and I still am. I don't want this for my kids but don't know how or what to do to change it.

Yes very good point @mathanxiety about there not being much in the middle in developing countries. My SIL is from ME and trades that can do well here like plumbers and electricians are very poorly paid as they are considered labour. Specific professions such as a doctor, engineer, accountant propel you to the top of society financially.