Neither.
The bottom line is that the exchange rate in CR is tied to nothing. Just like the rest of the Keystone Cop operation going on down there, it's done on whimsy and most certainly "USA holiday dates" can impact on it, but not to the extent that the stuff is getting jerked around right now.
I have kept every Mas X Menos receipt ever given; every Auto Mercado receipt; every SL bar receipt; every Key Largo receipt; written down every chica price for services rendered, etc., etc., etc. and graphed same against the exchange rates since 2006. It's a funny graph to view and that's about all. There is no semblance of reason relative to the corresponding price increases for the same item in the food stores and that's a fairly adequate barometer for me. Yes, I understand the very large majority don't use "those" food stores, using Central Market or even closer sources to the farmer, rancher, etc., but that's not really important to me.
It's a simple explanation, really: The rich are getting richer while the poor are getting poorer; the "middle class" is shrinking; and I'm good for a 2-5 week stay and then it's time to get back to HQ.....
But believe me I am not complaining! Living here and on a fixed income, any drop hurts, and any rise is great!