Poor buying when things expensive they are expert buying top in everything and FOMO in also the middle class are expert on buying highest prices and not just buying they buy it with credit.
Rich buys when something is with good price low price poor buys just to spend money.
Middle class behave like poor too they buying expensive.
A poor man buys things in most cases to please others, they many not necessarily need that item or commodity, for example you will see a young guy who do not have any investments, he is not even sure of what he will eat tomorrow but when he cashes out the very first thing on his mind is to buy an iPhone. This is not the mentality of a rich man, a rich man buys things out of need and not out of want, meaning that they focus on things that are more important.
The thing is that the poor do not take risk the way rich people do, and again not to buy things the way they think to get but I know that the poor people do not get what they want at a convenient time, what matters in life is that we need to know that what ever we are doing we should know that the difference between the poor and the rich is very far and is not what we can evaluate to infinity, so I believe that the space the rich gives to the poor is far in terms of taking risk and other things that's related with investment, many persons who is into cryptocurrencies investment it doesn't matter or measured by poor and rich but what matters is to have a conclusion of what you wants to do