At present, I am preparing a paper (alongside Mathieu Bédard) based on my empirical constructs (found in my thesis) which studies the (in)famous experiment of the colony of New France with playing card money. During that “funny” episode in monetary history, the government of New France decided to issue money with values signed on the backs of playing cards (thus, the playing card money or monnaie de carte). I am still polishing the paper and some key aspect. I am happy however to show the price index I constructed (with different weights) and I want to ask you, “at what moments did the two attempts with paper money occur”?
I don’t need to give any hints …
Vincent Geloso 
What does the y axis represent again?