Experts say the phenomenon exists, but it may be to some extent an illusion.

Until a few years ago, this phenomenon existed in urban neighbourhoods too.

We don't have any evidence that this phenomenon even exists, except for our eyes.

And many social scientists have argued that the "acting white" phenomenon doesn't really exist.

Does a phenomenon fully exist until it has a name?

Both phenomena can exist simultaneously in the same system.

But there is no doubt that a phenomenon exists.

"I simply didn't know that such a phenomenon existed on the scale you are describing," one executive told me.

All people are free in Mauritania and this phenomenon no longer exists.

The phenomenon they discovered exists above and beyond this industry effect.