This is true, but the discussion is turning from economics to ideologies. In the end, the world has been using a form of trickle-down economics for well over a century.
First worlds, developed nations, big wigs with money invest globally to third world nations with the benevolent promise of opportunities, jobs, growth, etc. we know from history, experience and reality that this system works, but terribly. The costs in terms of human labour, ethics, global pollution and environment, etc. are partly a result of this rigid framework that was created for a world that was much different in the 1900s vs where we stand today.
A lot of policies are constantly based on outdated models or methods which are not designed to take considerations of anything new or different. When something important and big enough does come along, it takes years or decades with the cooperation of multi nations to get a ball rolling. For example digital currency.
The problem is that the majority of the world says they want change but said minority are content being armchair critics and still living the status quo. The players (nations govts tyrannts billionaire philanthropists) that can change things wont because for one, it probably costs too much or requires far too much coordination, logistics and agreement for any one person/party to take charge, and 2) because people/parties are human and humans care about themselves before others (for the majority again).
To change the world in terms of global economics and to change the system, i mean a real overhaul, would be near impossible at this stage in our world. No fucks are given...by the ones who should give a fuck.
The best we can do is build upon our own skillsets n abilities to play the game of life we are raised to play. In the end though, through perspective, you won the lottery, that is being born in a place like canada or america. At least we have the luxury of complaining about having a mortgage or debt because it usually means u can afford to have a home or visa to buy more shit u dont need.