Before electronic banking, how did wealthy businessmen keep track of their earnings?

Question

Before electronic banking, how did wealthy businessmen keep track of their earnings?

In: 399

Answer 1

Had an elderly weird aunt in the family who kept her money in a half dozen or more local banks. She used the bus to go to every bank, every weekday, and had them add in the interest earned onto her passbooks. (yes, she had substantial deposits)