A recent experiment seems to give a clear demonstration of this effect.

It's a clear demonstration of how we prefer to keep costs down.

He was also alone a clear demonstration of trust.

We also look for a clear demonstration of commitment to corporate social responsibility.

This was a clear demonstration that elections in Venezuela had to be won by the right people or else.

There has never been a clear demonstration of cause and effect.

Isn't this whole debate about the 50p rate a clear demonstration that we structure society to benefit the rich?

It was a clear demonstration that all participants are part of the European family.

But Iraqis need a clear demonstration that security and rebuilding is possible.

But it is a clear demonstration of broad disappointment in the government.