How much do you tip your hairstylist and local verduleria?

The standard Argentine tip is 10% whenever tipping is part of the deal (e.g. restaurants).

I've really never seen anyone tip their local verdulero. It's more of a shop than a service, so tipping is not expected. I'll often let them keep the change if it's anywhere between $1-10 pesos.
i give my barber 50 or 100 usually. depending on what i have with me.
Service here is absolutely terrible - I give minimum tip most of the time unless the person actually puts some effort in. I don't like rewarding poor performance because it does not create change for the better.