OK, I’ll argue this from a utilitarian standpoint, as I’ve been arguing in favor of libertarianismon the basis of rights in another thread. First off, Marx was an idiot, but I guess that’s just a personal opinion of mine.
Let’s look at whether or not the system Marx describes will work as well as capitalism. We’ll start with the principle that society is best served if erveyone does the thing he or she can do that produces the greatest benefit to society. Therefore, society should encourage everyone to provide the service to society that best meets society’s needs.
Now lets take an example of the capitalist exploitation that Marx speaks of. I am (for the purposes of this example) the standard capitalist pig exploiter. I have an idea for a great car, maybe some rough sketches or something. How do I go about getting it built?
First I need to borrow money from fellow members of the oppressive upper class. The people talk with me and then decide whether or not they want to offer me money to accomplish my dream of building this car. Assuming I get the money, the next step is to hire some engineers to draw up the full plans and work out the details and all that. After they are done, I can get some mechanics to assemble the thing.
Now, Marx would indicate that this car, having been built by the mechanics, would belong to them. In terms of the actual labor put in, the mechanics did the most, then the engineers, then me, then the bankers, who only really had to put up with listening to me. In terms of how replaceable each party was, mechanics are everywhere, automotive engineers are extensively trained, and are thus more rare, people with the necessary money to finance the project are few and far between, and I’m one of a kind, baby.
Basically, the car (which, in case I didn’t mention, provides a substantial improvement over every car ever produced) could never have existed without me, but I make out worse than the grease monkey I hired to weld the chassis together, according to Marx. In Marx’s system, I am not encouraged to go into the business of dreaming up great cars, and the engineers are not encouraged to actually pay attention in all those boring engineering classes.
Capitalism provides encouragement for people to provide the services to society for which they are best suited. Smart people with incredible skills at delicate handwork are encouraged to become brain surgeons rather than needlepoint artists, because society places greater value on saving lives than needlepoint artwork. Of course society places an incredibly great value on being able to shoot a rubber ball into a hoop ten feet off the ground for our entertainment, but in general it does things that make more sense.
So, from the perspective of what is best for society, Marx’s system is woefully inferior to a capitalist system. All decisions made with respect to the profits from selling the car I (with a great deal of help) created should remain with me as a reward and encouragement to continue in a line of work that fills a need in society. As this is the position in society that I am best suited for, I am the one who should be encouraged to do so by society.