As the article talks about Marx, let us consider the falsifiable predictions of Narx, who died in 1883.

* Economic crises (recessions, depressions) would continue, and becone worse over time (example: subprime crisis of 2008)

* profitability rates would go down over time

* wealth would concentrate more over time

* middle class would be slowly shrunk - say, doctor's losing their own offices and made to see people in 15 minute appointment blocks

* real hourly wages would fall

* proletariat will revolt and displace the bourgeoisie, in the manner the bourgeoisie overthrew the feudal order

These predictions are all falsifiable