>>17154856true equilibria exist only in virtual systems thanks to idealistic modelling of the underlying circumstances. Think a perfect production line in Satisfactory with an infinite supply and infinite destruction at the end via Awesome Sink.
The reality will always stay real and humans stay humans. People die. People age. Trends come and go. Lifestyles change. Adaptations leading to adaptations.
Or, to put it in much simpler words, at some point in time something happens nobody expected which is then a new circumstance everybody adapts to or fails to adapt to.
In a more philosophical stance, unless 100% happiness for every stakeholder is archived, there will always be a struggle to improve something, usually the own circumstance. Due to limited resources or the feeling of scarcity, people set their "100%" ever higher, we call this "greed".
The big picture is something we don't even know what precisely and how it happened, happened, and our universe was born. Particles and all existing energy burst out of what seems like a single point in space violently smashing together due to what we suspect is gravity and maybe some other shit we don't even get yet, yadda yadda stars are born more gravity and now a huge bunch of rocks fly through space in a somewhat orderly fashion and we're lucky enough to have a rock where sentient beings can thrive after they came into existence thanks to some sulfur and carbon smashing together into "organic" compounds completely randomly.
After the first being ever came to life, we have economics as we define them happening because that being has to eat and shit like everything does. Trees eat CO2 and shit O2. We eat all kinds of fucked up matter and shit shit. It's all spending energy and generating hormones suggesting us through evolutionary pressure that what we did was right for us, basically learning just like neural networks through failure but the failed don't live to tell the tale so here we are in a macroeconomy controlled by jews and humanity for a big majority enslaving itself to some lines going up in exchange for paper which we are told can be exchanged for goods and services and because we are told that quite hard by rich people and people with guns and who we voted for, you actually can, magically.
Welcome to life, enjoy your stay.