True, when people don't have high-paying skills, they can still do simple jobs (but with low salaries). Without people who take that kind of job, the economy would slow down or maybe the society would even crumble. If no one cleans streets, toilets, etc., it would be a disaster. Also, most people are poor at some point in their life, and they can escape poverty by continuously learning and working hard. In other words, it serves as competition and competition is good for the economy.
All people are useful in a community, we also saw what happened in France, Paris if I remember correctly, when cleaning workers went on strike. The whole city fell apart and was full of rubbish. Everyone plays an essential role in a community, not all people are to be doctors, lawyers and generally have an academic career. We also need handymen, such as plumbers, electricians, cleaning workers and so on for the community to function properly.
Poor people don't have any contributions to the GDP of the economy this is quite okay, but saying it because they don't belong to the national workforce, I disagree with this statement because individuals don't need to belong to the national workforce before you can contribute to the growth of the economy, for instance in my country only a few percent like 30% are working for the government, now how can this percentage improve the economy, this will be done in the addition to the foreign investors
I disagree, people barely making a living contribute to the country's economy, as I mentioned earlier, they are a vital gear in the community, without them, cities wouldn't be able to function properly. On top of that they contribute a great deal in the economy, because a large number of them are unable to save money and spend every bit they earn, while wealthier people tend to save and invest instead of spending them.