There are some cliches in this possibility, that people not affording the things they think they need, (for Madison Ave. suggests what they want), the producer will develop a downward staging market, where they will increasingly devalue the items that particular economic level cannot afford. Gradually, they will reach total incompetents.
For instance, at certain depressed areas, cell phone outlets sponsored by the government are literally giving away cell phones. Some of these are at welfare agencies, and the only requirement is having proof of being a recipient of welfare. The phone is free, and a minimum amount is withheld from the dole, to pay for the monthly charge.
As far as the recher getting richer, that has already reached the limit, a very few families, or maybe even one family controlling all the wealth of the world. They need not acquire more and more, because they probably know that there are limitations to that too, where, beyond a certain limit, getting more would become counterproductive.
Therefore they play the options game, hedging their goals to correspond with the statistics of the acquired standards related to their liquidation of investments to fund that standard.(Of living).
So the rich getting richer indefinitely may not work. Rather than looking at class exhaustion do to monetary imbalances, the big weakness in accumulation is lies in the unlined realm differential goal between needs and wants as related to appreciation of use of marketable items. There may reach a time when the most extravagant invention may be passed on with a casual shrug, making invention and utilization not worth while, and unmarketable.
This is present even now, with the used car business as an example. The sight of unending supplies of used cars being practically given away by in house financing to almost any creditworthy buying purchaser, connects loosely to Marx's concept of diminishing returns. This is the fragility underbelly for f the market system.
The need to push markets to the very limits, using any and all econo-political stratagems, for instance, is the rationale for the seeming abberrance of the Trump adimnistration. Obama was a rescue effort, to prop up social diversion, and once the calamity was over, is streamed masures of reeling in some kind of
ideology to prop up a vacuum of any kind of system.
Trump is the last political hurray underlying the desperation of not being able to innovate as fast as needed to accommodate the technological advances needed to keep the interest in the market alive.
This is why ultra technology dealing with space exploration and the possibility of colonizing new worlds in deeper parts f space have taken an almost obsessional preoccupation. Flying cars is another. The public imagination needs to stay awake and hungry for more at an ever increasing rate of change.
For the reasons above, a new one world market is no longer sufficient to justify a limitless Capital gain, product innovation needs to take a quantum jump pretty much coinciding with the point at which total accumulated knowledge per-se will reach a limit.
Capitalism is the best method at the moment to overcome the coming consequences of the coming of
The Spiritual Crisis of our time, because it is the system most adapted to innovation as the major compensating factor in this instability.