Could you set up a bookstore?
I know there are already rabbithole bookstores in the game (maybe I am thinking of Sims 3 now that I think about it more than Sims 4) but in the small business vein could a sim setup their own activ...
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You could make a library and charge hourly fees or you could take and buy books from a bookshelf and place them on retail surfaces.
If you don't have B&H this won't work unless you set up a retail shop with GTW.
