Prove to be

 Avoid sentences such as this: 

In the end,  market liberalization will prove to be harmful.

What the writer means is that market liberalization will turn out to be harmful.

Only people, not abstract concepts such as market liberalization, can prove things. Market liberalization might, at a pinch, show something or demonstrate something, but not prove anything. 

Finally, to prove means to demonstrate the truth of a hypothesis. The important thing to remember is that it confirms, corroborates, backs up something  that was already suspected, expected or believed, so it should not be used for an unexpected result. 

Thus: 

The ban on traffic proved to be more effective than anyone had dared hope should be: 

The ban on traffic turned out to be more effective than anyone had dared hope.