A layer two solution that handles all the micro payments throughout the day, with an on-chain settlement at the end of business (daily/weekly) is very feasible and one node can handle all the micropayments of a massive shopping mall

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Yeah, and that is really how most businesses operated up until things went digital. Someone went to a bank, and got a bunch of change and put in cash drawers and their vault. Then, settled up with the bank and their accounts. Repeated each day.