No need to think about it far.
Investment is not a basic need for the lower class economic people. Investment is a routine for the middle and upper class economies besides having forward thinking.
The concept of investment for people with a lower class economy is simply saving when there is left over after their basic needs are met.

Is it good? Depending on economic conditions and level of intelligence.
How can people with erratic income to invest.
There is a sentence that I often hear "logic will not work if there are no logistics".