In the past, the poor was struggle to find something to eat, but now they can eat junk food or anything that can make them full even though it's not good for health.
In the past, middle class wasn't struggle to eat and they can go to school, but now they have secure high position in the company they work and they already have few assets.
In the past, the rich net worth was $1 Million, but now their net worth become $1 Billion.
Things getting better, but you should know that people around you are getting better too.
In order to understand where you get this vision from - tell me, if it's not a secret - what country are you from ?
I am not a resident of the US or EU (I am talking about the developed world), but I have friends there and the situation is different from what you describe....
Poor citizens receive both financial aid and social aid - from food and medical care to housing.
The middle class is the main layer of consumers. And they spend money the same way they spend money. On food, education, entertainment, vacations,..... The middle class also owns major assets - residential real estate, savings, stocks.... Not all of them, of course, but many.
The size of capitals has changed, because in the modern world it is easier to earn money. And let's not forget about inflation after the mass of global turmoil of the last 10 years.