Marx, when speaking as an economist, was talking about labor as being value. I'm not a marxist in any way. Honestly, I don't have time for politics, and it seems there are plenty of people that have. What I'm talking about is work as in work in physics. You need to convert energy to do that, and converting energy causes the amount of
exergy to drop.
When I give some simple thought experiments, you cannot answer that you get eight liters of diamonds a day. Any global model is not about you alone, no matter what political philosophy you admire. Many people earn a lot, and much more people starve. Personally I think that's wrong, but I have no illusion about that going to change due to politics, philosophy or whatever.
Even in a highly probable "post apocalyptic" future, you won't find equality like you won't find money. You will probably find gold though, the main difference between money and gold being that the amount of gold atoms in the system is constant, and that the element is very non reactive. That is what gives it it's value, and it has always been that way. Gold in itself has relatively low utility.
When I look around, I normally see humans and friends, but when I take a few steps back, I've been taught to look at the whole planet as a biophysical system. That is a very complex system that nobody understands completely, but all it's alarms are blinking red. If the economy can survive that long, from system models it seems that we will reach a peak in 20-30 years, after which, climate, running out of vital resources including exergy, and a lot more mixing up in a "perfect storm", will lead us to go towards a planet like before the industrial revolution in the following decades. Before the green revolution, the carrying capacity, due to simple agriculture, was roughly one billion, though global starvation was much higher than today. In that case, the population curve will drop as quickly as it's currently climbing, and we will lose, at least, more than a billion per decade, depending on how well we behave towards one another. Considering that much more people will be starving, I don't believe we will behave well.
That is not a completely certain scenario. Many renowned economists look in their crystal balls and say that we are due for a "crisis" worse than 2008, that will last longer. That in itself might somewhat change the population size and the growth rate on resource spending, but the current market is not something we've experienced before. It might very well, considering the subzero interest rate and QE being "the only option", that the crisis will be a total collapse of the global financial system, something we we're frighteningly close to in 2008. We've seen something like collapses nationally, but even though 29 was a crash it wasn't a collapse, likely leading to money loosing their value. Some of the economists that "mysteriously" predicted 2008 say that they expect something very bad to happen in 2020. If that is a collapse, then much will change with the business as usual models, but it won't be pretty.
The solution is to realize that without exergy the system does not work. Currently we use roughly 20% of the energy flowing through the biosphere, and we have more than doubled that number in ~100 years. On top of that we use roughly the equivalent of that by mainly burning fossil fuels. We need to replace that exergy supply quickly, meaning that we build some sort of replacement, but we need to use exergy for that as well, and currently the available exergy is mainly fossil fuels, so even just the task of building the alternative will cause climate change. If we use the remaining exergy on funny stuff, then we have to build it by hand.
A part of the solution is also to realize that growth economy can't continue, and I suggest we start considering what we consider value. Honestly I don't think we will wake up, but I've been told to "think positive", be constructive, and try and describe solutions.