We don't know much about the Trump tax plan because naturally, there are very few details in the "plan." What there is, however, tells us it's an entirely conventional Republican tax plan. It's mostly a means to accelerate upward wealth redistribution...in this case to a larger extent than anything we've done previously. It's essential that we put a halt to the myth that giving more money to the rich will ever accomplish anything other than making them richer. If we've learned anything from almost 40 years of trickle down economics it should be that.
At this point economic inequality is at least equal to what it was during the Gilded Age and Roaring Twenties...both periods which preceded enormous political instability. That political instability is certainly present now. It's just as important that we make a change for pure economic reasons, however. The economy simply cannot survive with ever-increasing inequality...and ultimately neither can civilization as we know it.
That economic stratification may lead to collapse on its own, on the other hand, came as more of a surprise to Motesharrei and his colleagues. Under this scenario, elites push society toward instability and eventual collapse by hoarding huge quantities of wealth and resources, and leaving little or none for commoners who vastly outnumber them yet support them with labour. Eventually, the working population crashes because the portion of wealth allocated to them is not enough, followed by collapse of the elites due to the absence of labour. The inequalities we see today both within and between countries already point to such disparities. For example, the top 10% of global income earners are responsible for almost as much total greenhouse gas emissions as the bottom 90% combined. Similarly, about half the world’s population lives on less than $3 per day.
For both scenarios, the models define a carrying capacity – a total population level that a given environment’s resources can sustain over the long term. If the carrying capacity is overshot by too much, collapse becomes inevitable. That fate is avoidable, however. “If we make rational choices to reduce factors such as inequality, explosive population growth, the rate at which we deplete natural resources and the rate of pollution – all perfectly doable things – then we can avoid collapse and stabilise onto a sustainable trajectory,” Motesharrei said. “But we cannot wait forever to make those decisions.”