Follow one overdue invoice through a manual collections process. Someone pulls the aging report — usually because cash is tight, not because it's Tuesday. They scan the list and decide who to chase, which in practice means whoever owes the most or whoever they're least afraid of annoying. Then they dig through the email thread to check what was last said, draft a reminder from scratch, agonize over the tone, send it, and move on. The follow-up to that reminder depends entirely on whether they remember.
The visible cost is the hours: report-pulling, thread-archaeology, tone-crafting, one invoice at a time. The invisible cost is bigger. Chasing money is the task everyone quietly defers, so invoices drift from 30 days to 60 to 90 while nobody makes contact. The older an invoice gets, the fuzzier everyone's memory of the work gets, and the harder the conversation becomes. Some of those invoices never get collected — not because anyone disputed them, but because the chase petered out.
None of this is judgment work. It's calendar-watching, thread-reading, and template-writing. The one genuinely human part, the phone call to a good customer who's gone quiet, is the part that keeps getting crowded out by all the rest.