They work differently because these two poor and rich people have different views on the future.
Rich people spend their money on something that could give them returns or profit while poor people spend their money on something don't have. They don't afraid to risk their money because they believe that it works fine and with a plan. But poor people don't do it because they already think about failure and losses.
Your argument is wrong, if you say the poor buy things they don't have, do the rich always buy things they already have?
When it comes to profit, they will always buy it for their benefit.
When it comes to future outlook, I'm sure they also want a happy ending.
In my opinion, why do people become poor and rich because of their mindset about how to manage finances, no matter how little or how much money is managed, people who are good at financial management always maximize their money for developing their business, whatever they buy is definitely aimed at smooth running or productivity in business or work.
IN my humble opinion - in most case - Rich people would spend their money for their purpose that could give them returns or profit while the poor people are struggling with their bills spend their money on something don't have.
There are many opinions that differentiate the mindset of the rich and the poor, but all of these opinions cannot be leveled, because sometimes the situations and conditions are different.
Like rich people, I'm sure most of them have been born into families that were originally rich, and at least are well off. So surely, the habits of their rich parents will be taught to their children. So from a young age they are used to an affluent life, and when they grow up, they only have to ask their parents for capital, and they can start running their own business.
And when it comes to people who are poor, there are also those who were born from backgrounds that are indeed poor, there are also those who were initially rich or affluent, but because they could not manage and organize their assets, they eventually became bankrupt. Not a few people who are poor at first have rich parents, but because their children feel too safe and feel they don't need to look for wealth anymore, in the end their children fall down, because they have never learned about the difficulty of making money.
So in essence, when it comes to spending money, sometimes even rich people waste their money just for fun purposes, maybe it's even rich people who buy a lot of things that really aren't important. Because they have a lot of money, most of them waste their money on things that really don't really matter, such as buying expensive bags, expensive shoes, and expensive vehicles. Even though if you look at its use, items that have low prices also have the same use (I'm here taking my opinion from the facts).
And while poor people, in my opinion, tend to save money all the time, because their income is mediocre, it keeps them thrifty. Of course they only buy basic needs, even if they are cheap, the most important thing is that they have a use for them.