It seems that (for obvious reasons!) the bulk of the action is happening in US and China. However, I am also surprised that currently transaction volume in currencies of Brazil or Russia exceeds those in Euro or Yen...
"Taxi drivers told you what to buy. The shoeshine boy could give you a summary of the day's financial news as he worked with rag and polish. An old beggar who regularly patrolled the street in front of my office now gave me tips and, I suppose, spent the money I and others gave him in the market. My cook had a brokerage account and followed the ticker closely. Her paper profits were quickly blown away in the gale of 1929."
Yeah. Well.
Funny thing about "bubbles", they're usually reliably identified only after-the-fact...