[Natanael_L]

We tried for centuries to make both airplanes and perpetual motion machines. Eventually we succeeded with one and proved the other physically impossible.

A long series of failures only proves that those specific things didn't work. You need more than that to come to a final conclusion.

[mc32]

That may very well be true but such thing will not be "Marxism" or "Capitalism" it will be however a "political and economic system" Just as what we have flying now may be a flying machine or aeroplane but not an "Ornithopter".