Really, plumet? The only thing that's plummeted is MtMickeyMouse goxtokens/goxbucks exchange rate (that's down +80%), and that's got not much to do with the real world. All other exchanges took a bit of a hit (15% or thereabouts) but are so far holding on to that.
The title makes sense if you interpret "Bitcoin Exchange" as singular, although my initial instinct was also to not do that.
it's misleading regardless because prices is plural in "Bitcoin Exchange Prices"