Great question — answering as the UphillTech team:
As elaborated here , there were two standard sizes of fresh yeast common in the US, small with 3/5 oz, and large with 2 oz. Without further sources we can not be sure whether the “5 cents” is truly the smaller size as discussed (although it’s reasonably likely). What I would recommend is that you make your dough with the smaller amount for one very simple reason: Yeast is a living organism, so if you add too little, you simply need to wait a bit longer until it has multiplied enough to give your dough the desired lift. Add too much initially, and you run the risk of an overpowering yeast taste and a dough that goes into overly risen faster than you can shape and bake the cookies. This also...
Full answer by Stephie: https://cooking.stackexchange.com/a/122744 (CC BY-SA 4.0).
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